Fix wrong `sudo ceph -c` command in lib/ceph

The `sudo -c ${CEPH_CONF_FILE} ceph ...` in lib/ceph misplaced
`ceph`. The correct syntax is `sudo ceph -c ${CEPH_CONF_FILE} ...`,
see lib/ceph:308.

While installing ./stack.sh with ceph enabled, the above malformed
command raises a `usage: sudo -h | -K | -k | -V ...` error and stops
the installation.

This patch fixes `sudo -c ${CEPH_CONF_FILE} ceph ...` by moving
`ceph` to the right place.

Change-Id: I3da943d5a353d99b09787f804b79c1d006a09d96
Closes-bug: #1453055
diff --git a/lib/ceph b/lib/ceph
index 76747cc..4068e26 100644
--- a/lib/ceph
+++ b/lib/ceph
@@ -279,7 +279,7 @@
     # configure Nova service options, ceph pool, ceph user and ceph key
     sudo ceph -c ${CEPH_CONF_FILE} osd pool set ${NOVA_CEPH_POOL} size ${CEPH_REPLICAS}
     if [[ $CEPH_REPLICAS -ne 1 ]]; then
-        sudo -c ${CEPH_CONF_FILE} ceph osd pool set ${NOVA_CEPH_POOL} crush_ruleset ${RULE_ID}
+        sudo ceph -c ${CEPH_CONF_FILE} osd pool set ${NOVA_CEPH_POOL} crush_ruleset ${RULE_ID}
     fi
 }