Drop requirement on octavia-lib

octavia-lib is only required to get a constant which actually should be
in the octavia-tempest-plugin codebase like other protocols are.

Change-Id: I269da85a9a7adabce340aa436d9457b12dee6e36
diff --git a/octavia_tempest_plugin/common/constants.py b/octavia_tempest_plugin/common/constants.py
index 0122424..5503b7f 100644
--- a/octavia_tempest_plugin/common/constants.py
+++ b/octavia_tempest_plugin/common/constants.py
@@ -101,6 +101,7 @@
 HTTP = 'HTTP'
 HTTPS = 'HTTPS'
 TCP = 'TCP'
+TERMINATED_HTTPS = 'TERMINATED_HTTPS'
 
 # HTTP Methods
 GET = 'GET'
diff --git a/octavia_tempest_plugin/tests/barbican_scenario/v2/test_tls_barbican.py b/octavia_tempest_plugin/tests/barbican_scenario/v2/test_tls_barbican.py
index 27663b2..25f741a 100644
--- a/octavia_tempest_plugin/tests/barbican_scenario/v2/test_tls_barbican.py
+++ b/octavia_tempest_plugin/tests/barbican_scenario/v2/test_tls_barbican.py
@@ -25,8 +25,6 @@
 from tempest.lib.common.utils import data_utils
 from tempest.lib import decorators
 
-from octavia_lib.common import constants as lib_consts
-
 from octavia_tempest_plugin.common import barbican_client_mgr
 from octavia_tempest_plugin.common import cert_utils
 from octavia_tempest_plugin.common import constants as const
@@ -222,7 +220,7 @@
         listener_name = data_utils.rand_name("lb_member_listener1-tls")
         listener_kwargs = {
             const.NAME: listener_name,
-            const.PROTOCOL: lib_consts.PROTOCOL_TERMINATED_HTTPS,
+            const.PROTOCOL: const.TERMINATED_HTTPS,
             const.PROTOCOL_PORT: '443',
             const.LOADBALANCER_ID: self.lb_id,
             const.DEFAULT_POOL_ID: self.pool_id,
diff --git a/requirements.txt b/requirements.txt
index c9f839c..3b78bc3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,6 @@
 python-dateutil>=2.5.3 # BSD
 ipaddress>=1.0.17;python_version<'3.3' # PSF
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
-octavia-lib>=1.0.0 # Apache-2.0
 oslo.config>=5.2.0 # Apache-2.0
 oslo.log>=3.36.0  # Apache-2.0
 oslo.serialization!=2.19.1,>=2.18.0 # Apache-2.0