[MERGE] Only sign 8-bit strings

[John Arbash Meinel]

The attached patch changes GPGStrategy.sign() so that it rejects Unicode
strings that are passed in.

This is both because it is conceptually more correct, and because it
seems there is a discrepancy in some versions of python. Where now doing
subprocess.Popen.communicate(u'foo') will write out the raw UCS4 bytes.

It turned up mostly because of pqm-submit, which was passing Unicode
strings for the urls (because we read them from ConfigObject which
always returns Unicode, even though they should be 7-bit ascii urls).

I've updated pqm-submit because it was breaking the pqm (or at least the
web interface).

I realize this is an incompatible API, but the old one was incorrect, so
I don't think we need to deprecate it.

John
=:->
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