Removing zone choices that overly-limit available zones for gce

Fixes #7270

cloud/gce

@@ -107,7 +107,6 @@ options:
       - the GCE zone to use
     required: true
     default: "us-central1-a"
-    choices: ["us-central1-a", "us-central1-b", "us-central2-a", "europe-west1-a", "europe-west1-b"]
     aliases: []
 
 requirements: [ "libcloud" ]
@@ -355,9 +354,7 @@ def main():
             state = dict(choices=['active', 'present', 'absent', 'deleted'],
                     default='present'),
             tags = dict(type='list'),
-            zone = dict(choices=['us-central1-a', 'us-central1-b',
+            zone = dict(default='us-central1-a'),
-                    'us-central2-a', 'europe-west1-a', 'europe-west1-b'],
-                    default='us-central1-a'),
             service_account_email = dict(),
             pem_file = dict(),
             project_id = dict(),

cloud/gce_lb

@@ -88,7 +88,6 @@ options:
     description:
       - the GCE region where the load-balancer is defined
     required: false
-    choices: ["us-central1", "us-central2", "europe-west1"]
   external_ip:
     description:
       - the external static IPv4 (or auto-assigned) address for the LB