when create/get/update failed return None rather than False

In openstack_util.py, when create/get/update network or other resources failed,
False is returned, which is incompatible with success return value such as id, network_nic.

JIRA: FUNCTEST-427

Change-Id: Id2f55d8524e5aff150ba6bfb799085377a63baa4
Signed-off-by: SerenaFeng <feng.xiaowei@zte.com.cn>
(cherry picked from commit 3e95a1cd0721924e89e2cfd2960d4736bc6c5588)

3 files changed, 7 insertions, 7 deletions

diff --git a/testcases/OpenStack/tempest/run_tempest.py b/testcases/OpenStack/tempest/run_tempest.py
index 7d023f5df..64a5ed778 100755
--- a/testcases/OpenStack/tempest/run_tempest.py
+++ b/testcases/OpenStack/tempest/run_tempest.py
@@ -132,12 +132,12 @@ def create_tempest_resources():
     tenant_id = os_utils.create_tenant(keystone_client,
                                        TENANT_NAME,
                                        TENANT_DESCRIPTION)
-    if tenant_id == '':
+    if not tenant_id:
         logger.error("Error : Failed to create %s tenant" % TENANT_NAME)
 
     user_id = os_utils.create_user(keystone_client, USER_NAME, USER_PASSWORD,
                                    None, tenant_id)
-    if user_id == '':
+    if not user_id:
         logger.error("Error : Failed to create %s user" % USER_NAME)
 
     logger.debug("Creating private network for Tempest suite")
diff --git a/testcases/features/promise.py b/testcases/features/promise.py
index 170f75494..f5db02617 100755
--- a/testcases/features/promise.py
+++ b/testcases/features/promise.py
@@ -87,7 +87,7 @@ def main():
     logger.info("Creating tenant '%s'..." % TENANT_NAME)
     tenant_id = openstack_utils.create_tenant(
         keystone, TENANT_NAME, TENANT_DESCRIPTION)
-    if tenant_id == '':
+    if not tenant_id:
         logger.error("Error : Failed to create %s tenant" % TENANT_NAME)
         exit(-1)
     logger.debug("Tenant '%s' created successfully." % TENANT_NAME)
@@ -114,7 +114,7 @@ def main():
     user_id = openstack_utils.create_user(
         keystone, USER_NAME, USER_PWD, None, tenant_id)
 
-    if user_id == '':
+    if not user_id:
         logger.error("Error : Failed to create %s user" % USER_NAME)
         exit(-1)
     logger.debug("User '%s' created successfully." % USER_NAME)
@@ -171,7 +171,7 @@ def main():
                                                       SUBNET_NAME,
                                                       ROUTER_NAME,
                                                       SUBNET_CIDR)
-    if network_dic is False:
+    if not network_dic:
         logger.error("Failed to create the private network...")
         exit(-1)
 
diff --git a/testcases/vnf/vIMS/vIMS.py b/testcases/vnf/vIMS/vIMS.py
index dfbb6759c..373761794 100755
--- a/testcases/vnf/vIMS/vIMS.py
+++ b/testcases/vnf/vIMS/vIMS.py
@@ -277,7 +277,7 @@ def main():
 
     tenant_id = os_utils.create_tenant(
         keystone, TENANT_NAME, TENANT_DESCRIPTION)
-    if tenant_id == '':
+    if not tenant_id:
         step_failure("init", "Error : Failed to create " +
                      TENANT_NAME + " tenant")
 
@@ -296,7 +296,7 @@ def main():
 
     user_id = os_utils.create_user(
         keystone, TENANT_NAME, TENANT_NAME, None, tenant_id)
-    if user_id == '':
+    if not user_id:
         logger.error("Error : Failed to create %s user" % TENANT_NAME)
 
     logger.info("Update OpenStack creds informations")