[WIP][?.?] support "remoteonly" value for the Access protocol parameter

[alex-rg]

Add "remoteonly" Access -- similar to "remote" but prevents usage in local context. Can be helpful to prevent race between local/remote endpts.

BEGINRELEASENOTES NEW: support "remoteonly" value for the Access protocol parameter -- similar to "remote" but prevents usage in local context. ENDRELEASENOTES

[chaen]

It seems fine to me, pending some more tests