require url scheme for credential type url inputs

This adds a url formatting type for credential input string fields
The validator for this formatting type will throw an error if the
provided url string doesn't have a url schema.

awx/main/credential_plugins/aim.py

@@ -15,6 +15,7 @@ aim_inputs = {
         'id': 'url',
         'label': _('CyberArk AIM URL'),
         'type': 'string',
+        'format': 'url',
     }, {
         'id': 'app_id',
         'label': _('Application ID'),

awx/main/credential_plugins/azure_kv.py

@@ -10,6 +10,7 @@ azure_keyvault_inputs = {
         'id': 'url',
         'label': _('Vault URL (DNS Name)'),
         'type': 'string',
+        'format': 'url',
     }, {
         'id': 'client',
         'label': _('Client ID'),

awx/main/credential_plugins/conjur.py

@@ -16,6 +16,7 @@ conjur_inputs = {
         'id': 'url',
         'label': _('Conjur URL'),
         'type': 'string',
+        'format': 'url',
     }, {
         'id': 'api_key',
         'label': _('API Key'),

awx/main/credential_plugins/hashivault.py

@@ -14,6 +14,7 @@ base_inputs = {
         'id': 'url',
         'label': _('Server URL'),
         'type': 'string',
+        'format': 'url',
         'help_text': _('The URL to the HashiCorp Vault'),
     }, {
         'id': 'token',