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/network/ldap_attr.py

@@ -19,19 +19,6 @@
 # You should have received a copy of the GNU General Public License
 # along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
 
-
-from ansible.module_utils.basic import AnsibleModule
-from ansible.module_utils.pycompat24 import get_exception
-
-try:
-    import ldap
-    import ldap.sasl
-
-    HAS_LDAP = True
-except ImportError:
-    HAS_LDAP = False
-
-
 ANSIBLE_METADATA = {
     'status': [
         'preview'
@@ -201,6 +188,17 @@ modlist:
   sample: '[[2, "olcRootDN", ["cn=root,dc=example,dc=com"]]]'
 """
 
+from ansible.module_utils.basic import AnsibleModule
+from ansible.module_utils.pycompat24 import get_exception
+
+try:
+    import ldap
+    import ldap.sasl
+
+    HAS_LDAP = True
+except ImportError:
+    HAS_LDAP = False
+
 
 class LdapAttr(object):
     def __init__(self, module):