Revert "Add vnc_api method set_user_roles"

The method set_auth_token has been unfortunately cherry-picked and this
introduces a regression since RBAC is not supported by the vnc_api
R2.20.

This reverts commit 77d2feb.

Change-Id: Ifdf28ce18de55b3bed3e59de56de415da1839c2e
Partial-Bug: 1546057

src/api-lib/vnc_api.py

@@ -281,7 +281,7 @@ def __init__(self, username=None, password=None, tenant_name=None,
             if 'user' in self._user_info:
                 self._headers['X-API-USER'] = self._user_info['user']
             if 'role' in self._user_info:
-                self.set_user_roles([self._user_info['role']])
+                self._headers['X-API-ROLE'] = self._user_info['role']
 
         #self._http = HTTPClient(self._web_host, self._web_port,
         #                        network_timeout = 300)
@@ -814,17 +814,4 @@ def resource_list(self, obj_type, parent_id=None, parent_fq_name=None,
         return resource_objs
     #end resource_list
 
-    def set_auth_token(self, token):
-        """Park user token for forwarding to API server for RBAC."""
-        self._headers['X-AUTH-TOKEN'] = token
-    #end set_auth_token
-
-    def set_user_roles(self, roles):
-        """Park user roles for forwarding to API server for RBAC.
-
-        :param roles: list of roles
-        """
-        self._headers['X-API-ROLE'] = (',').join(roles)
-    #end set_user_roles
-
 #end class VncApi