Set the min and max value of IntOpt config options

This patch sets the min and max value for all
IntOpt config options based on the functionality.

Change-Id: I959371c4ba8ede400f8f1eb3b271016769d8473e

blazar/cmd/api.py

@@ -32,7 +32,10 @@ from blazar.utils import service as service_utils
 
 
 opts = [
-    cfg.IntOpt('port', default=1234,
+    cfg.IntOpt('port',
+               default=1234,
+               min=0,
+               max=65535,
                help='Port that will be used to listen on'),
 ]
 

blazar/manager/service.py

@@ -38,11 +38,13 @@ manager_opts = [
                      'support.)'),
     cfg.IntOpt('minutes_before_end_lease',
                default=60,
+               min=0,
                help='Minutes prior to the end of a lease in which actions '
                     'like notification and snapshot are taken. If this is '
                     'set to 0, then these actions are not taken.'),
     cfg.IntOpt('event_max_retries',
                default=1,
+               min=0,
                max=50,
                help='Number of times to retry an event action.')
 ]

blazar/plugins/oshosts/host_plugin.py

@@ -56,9 +56,11 @@ plugin_opts = [
                      'of compute hosts by polling the Nova API.'),
     cfg.IntOpt('polling_interval',
                default=60,
+               min=1,
                help='Interval (seconds) of polling for health checking.'),
     cfg.IntOpt('healing_interval',
                default=60,
+               min=0,
                help='Interval (minutes) of reservation healing. '
                     'If 0 is specified, the interval is infinite and all the '
                     'reservations in the future is healed at one time.'),