Add quiet option to CLI

Closes #99

client-cli/pvc.py

@@ -3492,7 +3492,11 @@ def init_cluster(confirm_flag):
     '-v', '--debug', '_debug', envvar='PVC_DEBUG', is_flag=True, default=False,
     help='Additional debug details.'
 )
-def cli(_cluster, _debug):
+@click.option(
+    '-q', '--quiet', '_quiet', envvar='PVC_QUIET', is_flag=True, default=False,
+    help='Suppress cluster connection information.'
+)
+def cli(_cluster, _debug, _quiet):
     """
     Parallel Virtual Cluster CLI management tool
 
@@ -3510,6 +3514,7 @@ def cli(_cluster, _debug):
     if not config.get('badcfg', None):
         config['debug'] = _debug
 
+        if not _quiet:
             click.echo(
                 'Using cluster "{}" - Host: "{}"  Scheme: "{}"  Prefix: "{}"'.format(
                     config['cluster'],