Always create RBDs with bytes value

Converting into human results in imprecise values when specifying bytes
directly, which in turn breaks VMDK image uploads. Instead, just use the
raw bytes value when creating the volume instead of converting it back.

daemon-common/ceph.py

@@ -763,9 +763,7 @@ def add_volume(zkhandler, pool, name, size):
 
     # 2. Create the volume
     retcode, stdout, stderr = common.run_os_command(
-        "rbd create --size {} {}/{}".format(
-            format_bytes_tohuman(size_bytes), pool, name
-        )
+        "rbd create --size {}B {}/{}".format(size_bytes, pool, name)
     )
     if retcode:
         return False, 'ERROR: Failed to create RBD volume "{}": {}'.format(name, stderr)