Remove openstack.common.exception usage

Fixes-Bug: #1208734

This file is deprecated, stop using it.

Change-Id: I4ad53008a6d350dbf4003f4e01088e95d6b42a3e
Update help string to match API doc

This changes the text to match what we are stating in
the API documentation (clarifying with review 46569).

Since there is no validation, no changes were made for
peer-address, which is now a string and not IPAddress.
Also, we are leaving peer-id as mandatory, per the API
document.

bug-1225129

Change-Id: I9c3f14213785084349b56a4081e34c209b878ec4
Merge "Remove openstack.common.exception usage"
Merge "Update help string to match API doc"