api/lvm: add deactivate method to Volume class

Simply calls lvchange -an to deactivate a logical volume.

Signed-off-by: Jan Fajerski <jfajerski@suse.com>
(cherry picked from commit 8087600)

src/ceph-volume/ceph_volume/api/lvm.py

@@ -998,6 +998,12 @@ def set_tag(self, key, value):
         )
         self.tags[key] = value
 
+    def deactivate(self):
+        """
+        Deactivate the LV by calling lvchange -an
+        """
+        process.call(['lvchange', '-an', self.lv_path])
+
 
 class Volumes(list):
     """