fetch2/__init__.py: Make get_srcrev output configurable

The idea here is to support package version numbering similar to gitpkgv in
meta-openembedded. This commit is the first step towards such functionality.

The original plan was to add a "get_pretty_srcrev" method to the fetcher, as
per Richard's suggestion [1]. While writing this, I noticed that it would
become a copy of get_srcrev with only two lines changed. So to create something
more Pythonic than a boolean argument and conditionals around the calls to the
fetcher's sortable_revision, I just made the method to be called on the fetcher
an argument to the method. Defaulting to 'sortable_revision' prevents affecting
existing code.

Now if the git fetcher were to implement, say 'gitpkgv_revision' one could
set the following in a recipe:
  PKGV="1.2+${@bb.fetch2.get_srcrev(d, 'gitpkgv_revision')}"
and this would yield the same result as gitpkgv's GITPKGV variable.

See for the discussion leading to this change:
[1] http://lists.openembedded.org/pipermail/openembedded-core/2015-January/100345.html

Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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