[rdma] Update connection info for ixia api server (#3413)

* Add creds file with well known username and password to connect to ixia api server and update fixtures to use that info
Signed-off-by: Neetha John <nejo@microsoft.com>

How did you verify/test it?
Ran one of the ixia tests with the changes and it passed

Author: neethajohn

ansible/group_vars/ixia/creds.yml

@@ -0,0 +1,6 @@
+ixia_api_server:
+    user: admin
+    password: admin
+    rest_port: 443
+    session_id: none
+

tests/common/ixia/ixia_fixtures.py

@@ -57,7 +57,7 @@ def ixia_api_serv_user(duthosts, rand_one_dut_hostname):
         Ixia API server username.
     """
     duthost = duthosts[rand_one_dut_hostname]
-    return duthost.host.options['variable_manager']._hostvars[duthost.hostname]['secret_group_vars']['ixia_api_server']['user']
+    return duthost.host.options['variable_manager']._hostvars[duthost.hostname]['ixia_api_server']['user']
 
 
 @pytest.fixture(scope = "module")
@@ -72,7 +72,7 @@ def ixia_api_serv_passwd(duthosts, rand_one_dut_hostname):
         Ixia API server password.
     """
     duthost = duthosts[rand_one_dut_hostname]
-    return duthost.host.options['variable_manager']._hostvars[duthost.hostname]['secret_group_vars']['ixia_api_server']['password']
+    return duthost.host.options['variable_manager']._hostvars[duthost.hostname]['ixia_api_server']['password']
 
 
 @pytest.fixture(scope = "module")
@@ -87,7 +87,7 @@ def ixia_api_serv_port(duthosts, rand_one_dut_hostname):
         Ixia API server REST port.
     """
     duthost = duthosts[rand_one_dut_hostname]
-    return duthost.host.options['variable_manager']._hostvars[duthost.hostname]['secret_group_vars']['ixia_api_server']['rest_port']
+    return duthost.host.options['variable_manager']._hostvars[duthost.hostname]['ixia_api_server']['rest_port']
 
 
 @pytest.fixture(scope = "module")
@@ -103,7 +103,7 @@ def ixia_api_serv_session_id(duthosts, rand_one_dut_hostname):
         Ixia API server session id.
     """
     duthost = duthosts[rand_one_dut_hostname]
-    return duthost.host.options['variable_manager']._hostvars[duthost.hostname]['secret_group_vars']['ixia_api_server']['session_id']
+    return duthost.host.options['variable_manager']._hostvars[duthost.hostname]['ixia_api_server']['session_id']
 
 
 @pytest.fixture(scope = "module")