Adding GET API to backup

Get backup by ID.

Change-Id: I0a6422ab12449212d144d9fdec1a4c7b282bed85
BP: blueprints.launchpad.net/reddwarf/+spec/consistent-snapshots">https://blueprints.launchpad.net/reddwarf/+spec/consistent-snapshots

reddwarfclient/backups.py

@@ -32,6 +32,15 @@ class Backups(base.ManagerWithFind):
 
     resource_class = Backup
 
+    def get(self, backup):
+        """
+        Get a specific backup.
+
+        :rtype: :class:`Backups`
+        """
+        return self._get("/backups/%s" % base.getid(backup),
+                         "backup")
+
     def list(self, limit=None, marker=None):
         """
         Get a list of all backups.

reddwarfclient/cli.py

@@ -255,6 +255,11 @@ class BackupsCommands(common.AuthedCommandsBase):
     """Command to manage and show backups"""
     params = ['name', 'instance', 'description']
 
+    def get(self):
+        """Get details for the specified backup"""
+        self._require('id')
+        self._pretty_print(self.dbaas.backups.get, self.id)
+
     def list(self):
         """List backups"""
         self._pretty_list(self.dbaas.backups.list)