Fix mysql with adding ulimit -n 102400

Bug: After deployment of linux formulas and salt states
/etc/security/limits.conf are not applying, as result connections
to mysql failed with error (pymysql.err.OperationalError)
(1040, u'Too many connections')

Solution: create mysql.overide, where ulimit is set to 102400

Closed-bug: PROD-8427
diff --git a/galera/master.sls b/galera/master.sls
index efde836..07797b6 100644
--- a/galera/master.sls
+++ b/galera/master.sls
@@ -47,8 +47,17 @@
 
 galera_purge_init:
   file.absent:
-  - name: /etc/init/mysql.conf
-  - require: 
+  - name: /etc/init.d/mysql
+  - require:
+    - pkg: galera_packages
+
+galera_overide:
+  file.managed:
+  - name: /etc/init/mysql.override
+  - contents: |
+      limit nofile 102400 102400
+      exec /usr/bin/mysqld_safe
+  - require:
     - pkg: galera_packages
 
 galera_conf_debian:
diff --git a/galera/slave.sls b/galera/slave.sls
index 5a58186..7d1872e 100644
--- a/galera/slave.sls
+++ b/galera/slave.sls
@@ -47,7 +47,16 @@
 
 galera_purge_init:
   file.absent:
-  - name: /etc/init/mysql.conf
+  - name: /etc/init.d/mysql
+  - require:
+    - pkg: galera_packages
+
+galera_overide:
+  file.managed:
+  - name: /etc/init/mysql.override
+  - contents: |
+      limit nofile 102400 102400
+      exec /usr/bin/mysqld_safe
   - require:
     - pkg: galera_packages