Allow to configure advanced SSL options

This patch allows to configure advanced ssl options like:
  ssl_crl
  ssl_dhparam
  ssl_stapling_responder
  ssl_stapling_verify
  ssl_verify_client
  ...and others
The whole list of options may be found in nginx/files/_ssl.conf
Theirs description:
http://nginx.org/en/docs/http/ngx_http_ssl_module.html

The 'mode' trigger is deprecated and will be removed in future together
with _ssl_normal.conf and _ssl_secure.conf. All options should be
set from reclass directly.

The following options changed theirs types (for backward compatibility
new type will be applied only when mode is set to != secure)
ssl_ciphers, ssl_ecdh_curve - was string, become list
Please read README for more details

Added kitchen tests

Related-PROD: PROD-19154

Change-Id: I03e735af6ff6794610e00d745d5a7054fb02186a
diff --git a/tests/pillar/proxy_with_ssl.sls b/tests/pillar/proxy_with_ssl.sls
new file mode 100644
index 0000000..a6e498b
--- /dev/null
+++ b/tests/pillar/proxy_with_ssl.sls
@@ -0,0 +1,278 @@
+salt:
+  minion:
+    enabled: true
+nginx:
+  server:
+    stream:
+      rabbitmq:
+        host:
+          port: 5672
+        backend:
+          server1:
+            address: 10.10.10.113
+            port: 5672
+      unbound:
+        host:
+          bind: 127.0.0.1
+          port: 53
+          protocol: udp
+        backend:
+          server1:
+            address: 10.10.10.114
+            port: 5353
+    enabled: true
+    extras: false
+    bind:
+      address: 127.0.0.1
+      protocol: tcp
+    upstream:
+      horizon-upstream:
+        backend1:
+          address: 10.10.10.113
+          port: 8078
+          opts: weight=3
+        backend2:
+          address: 10.10.10.114
+    site:
+      nginx_proxy_site01:
+        enabled: true
+        type: nginx_proxy
+        name: site01
+        proxy:
+          host: 172.10.10.100
+          port: 80
+          protocol: http
+        host:
+          name: cloudlab.domain.com
+          port: 80
+        ssl:
+          enabled: true
+          key: |
+            -----BEGIN RSA PRIVATE KEY-----
+            MIIG4wIBAAKCAYEAq5spAL9CIZbe687oudIttun6ciXynqHmVb0wqpvKF7SwwrOh
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+            -----END RSA PRIVATE KEY-----
+          cert: |
+            -----BEGIN CERTIFICATE-----
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+            XtI=
+            -----END CERTIFICATE-----
+          chain: |
+            -----BEGIN CERTIFICATE-----
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+            -----END CERTIFICATE-----
+            -----BEGIN CERTIFICATE-----
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+          session_timeout: '15m'
+          session_cache: 'shared:SSL:15m'
+          mode: 'manual'
+          protocols:
+            TLS1:
+              name: 'TLSv1'
+              enabled: True
+            TLS1_1:
+              name: 'TLSv1.1'
+              enabled: True
+            TLS1_2:
+              name: 'TLSv1.2'
+              enabled: False
+          ciphers:
+            ECDHE_RSA_AES256_GCM_SHA384:
+              name: 'ECDHE-RSA-AES256-GCM-SHA384'
+              enabled: True
+            ECDHE_ECDSA_AES256_GCM_SHA384:
+              name: 'ECDHE-ECDSA-AES256-GCM-SHA384'
+              enabled: True
+          prefer_server_ciphers: "off"
+          buffer_size: '16k'
+          dhparam:
+            enabled: True
+            numbits: 1024
+          ecdh_curve:
+            secp384r1:
+              name: 'secp384r1'
+              enabled: False
+            secp521r1:
+              name: 'secp521r1'
+              enabled: True
+          ticket_key:
+            enabled: True
+            numbytes: 48
+          session_tickets: 'on'
+          stapling: 'off'
+          crl:
+            file: '/etc/ssl/crl.pem'
+            enabled: False
+          password_file:
+            content: 'testcontent22'
+            enabled: True
+          resolver:
+            address: '127.0.0.1'
+            valid_seconds: '500'
+            timeout_seconds: '60'
+          client_certificate:
+            file: '/etc/ssl/client_cert.pem'
+            enabled: False
+          verify_client: 'off'
+      nginx_proxy_site02:
+        enabled: true
+        type: nginx_proxy
+        name: site02
+        proxy:
+          upstream_proxy_pass: http://horizon-upstream
+        host:
+          name: cloudlab.domain.com
+          port: 31337
+      nginx_proxy_site03:
+        enabled: true
+        type: nginx_proxy
+        name: site03
+        proxy:
+          host: 172.120.10.100
+          port: 80
+          protocol: http
+        location:
+          /kek/:
+            host: 172.10.10.100
+            port: 80
+            protocol: http
+            size: 10000m
+            timeout: 43200
+            websocket: true
+            request_buffer: false
+            buffer:
+              number: 4
+              size: 256
+          /doc/:
+            host: 172.10.10.200
+            port: 80
+            protocol: http
+        host:
+          name: cloudlab.domain.com
+          port: 80
+      nginx_proxy_site04:
+        enabled: true
+        type: nginx_proxy
+        name: site04
+        location:
+          /:
+            host: 172.10.10.100
+            port: 80
+            protocol: http
+          /doc/:
+            host: 172.10.10.200
+            port: 80
+            protocol: http
+        host:
+          name: cloudlab.domain.com
+          port: 80