add support for server set metadata item

add set_meta_item to the servers python API as specified by the 1.1 API

Change-Id: I01c92cde18656b23b45aedd41c50d3a474d91435
Fixes ambiguous cli output between "None" and NoneType

Print hyphen(-) in python client output when attribute value is not
set(NoneType) so that it is distinguishable between "None" string
and NoneType value.

Change-Id: I5ec0f39f13aca45fa95ddb59472c20207c63bf91
Closes-Bug: #1266414
Merge "add support for server set metadata item"
Merge "Fixes ambiguous cli output between "None" and NoneType"