httprepo: suppress the `real URL is...' message in safe, common cases.
When the actual and requested URL only differ by trailing slashes,
there is no need to warn. As an example, this easily happens when
accessing repositories on Bitbucket over HTTP(S).
As far as I could tell, there were no existing tests for this
behaviour.
Checked out revision 0.
A a
Adding a
Transmitting file data .
Committed revision 1.
% initial roundtrip
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0 added a
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% second roundtrip should do nothing
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% new hg rev
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
% echo hg to svn
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0 b
% svn back to hg should do nothing
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% hg back to svn should do nothing
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