Upgrade key for ceph-osd

This change adds the upgrade key for the ceph-osd charm allowing
it to perform rolling upgrades.  This change is already in ceph-mon
and just copied over to make sure both charms have parity.

Change-Id: Icab7c6e4a2d841739736707b06ca252321b7f732

.gitignore

@@ -4,4 +4,4 @@ bin
 .testrepository
 .tox
 *.sw[nop]
-.pyc
+*.pyc

hooks/ceph.py

@@ -298,6 +298,16 @@ _radosgw_caps = {
     'osd': ['allow rwx']
 }
 
+osd_upgrade_caps = {
+    'mon': ['allow command "config-key"',
+            'allow command "osd tree"',
+            'allow command "config-key list"',
+            'allow command "config-key put"',
+            'allow command "config-key get"',
+            'allow command "config-key exists"',
+            ]
+}
+
 
 def get_radosgw_key():
     return get_named_key('radosgw.gateway', _radosgw_caps)

hooks/ceph_hooks.py

@@ -326,6 +326,8 @@ def osd_relation(relid=None):
             'osd_bootstrap_key': ceph.get_osd_bootstrap_key(),
             'auth': config('auth-supported'),
             'ceph-public-address': public_addr,
+            'osd_upgrade_key': ceph.get_named_key('osd-upgrade',
+                                                  caps=ceph.osd_upgrade_caps),
         }
         relation_set(relation_id=relid,
                      relation_settings=data)