Standbys' jsguis show link to the master server when its URI is known
Standby jsguis redirect to the master if known
Test js HA model
Merge pull request #1438 from sjcorbett/jsgui-more-ha

More HA info in the jsgui
PortForwardManager persistence: call entity.onChanged
stream map converter: avoid tag with numeric first char
Adds PortForwardManagerRebindTest
Merge branch 'fix/PortForwardManager-rebind' of https://github.com/aledsage/brooklyn into aled-1
create a brooklyn-persistence-safe pattern for PortForwardManager.
NB this will break callers who attempt to create instances. new patterns should be followed to ensure these are safe for persistence.