Update validate-modules (#20932)

* Update validate-modules

* Validates ANSIBLE_METADATA
* Ensures imports happen after documentation vars
* Some pep8 cleanup

* Clean up some left over unneeded code

* Update modules for new module guidelines and validate-modules checks

* Update imports for ec2_vpc_route_table and ec2_vpc_nat_gateway

lib/ansible/modules/cloud/openstack/os_image.py

@@ -17,12 +17,6 @@
 # along with this software.  If not, see <http://www.gnu.org/licenses/>.
 
 #TODO(mordred): we need to support "location"(v1) and "locations"(v2)
-try:
-    import shade
-    HAS_SHADE = True
-except ImportError:
-    HAS_SHADE = False
-
 
 ANSIBLE_METADATA = {'status': ['preview'],
                     'supported_by': 'community',
@@ -121,6 +115,12 @@ EXAMPLES = '''
       distro: ubuntu
 '''
 
+try:
+    import shade
+    HAS_SHADE = True
+except ImportError:
+    HAS_SHADE = False
+
 
 def main():