Changes

osmo_interact: improve vty transcript language by a regular rexex

Currently the transcript language understand 3 different tokens:
... (ignore all lines until the following line matches)
... !REGEX (ignore all lines except REXEX)

But to support osmo-stp with different compile options, the
vty help is indented with different amount of spaces depending on the compile options.
To support those add a regular regex using the prefix !r!

E.g.
OsmoSTP(config-cs7-as)# ?
-  description       Save human-readable description of the object
vs
+  description               Save human-readable description of the object

Change-Id: Iadcd7a8c3677548a6405e098fe53d0614ef2012c