[MERGE] Make built-in plugins display the same version than bzrlib.

[Vincent Ladeuil]

>>>>> "vila" == Vincent Ladeuil <v.ladeuil+lp at free.fr> writes:

>>>>> "jam" == John Arbash Meinel <john at arbash-meinel.com> writes:
    jam> Vincent Ladeuil wrote:
    >>> I've seen version [unknown] for built-in plugins far too much in
    >>> bug reports.
    >>> 
    >>> Let's stop that sillyness,
    >>> 
    >>> Vincent
    >>> 
    >>> 

    jam> Why not just give builtin plugins an explicit
    jam> version_info of their own?

Because they are part of bzrlib and as such we will never use two
different versions of the plugin for a given bzrlib version[1].

I'll merge as is but if you can convince me otherwise, I'll send
another submission.

   Vincent

[1]: I have other possible explanations but they don't fit in
this email margins :-)