Don't cleanup ceph config when REMOTE_CEPH=True

If REMOTE_CEPH=True then we didn't write the contents of /etc/ceph, so
we shouldn't delete them.

Change-Id: I6291c6562a2864de775b1acb4be0be35b866f30d
diff --git a/lib/ceph b/lib/ceph
index 251cfd1..76747cc 100644
--- a/lib/ceph
+++ b/lib/ceph
@@ -151,14 +151,14 @@
     if [[ -e ${CEPH_DISK_IMAGE} ]]; then
         sudo rm -f ${CEPH_DISK_IMAGE}
     fi
+
+    # purge ceph config file and keys
+    sudo rm -rf ${CEPH_CONF_DIR}/*
 }
 
 function cleanup_ceph_general {
     undefine_virsh_secret
     uninstall_package ceph ceph-common python-ceph libcephfs1 > /dev/null 2>&1
-
-    # purge ceph config file and keys
-    sudo rm -rf ${CEPH_CONF_DIR}/*
 }