[merge] Fix push output (bug 49742)

[John Arbash Meinel]

https://launchpad.net/bugs/49742

After the encoding changes, I missed a final newline as part of writing 
out the saved push location. The attached patch changes the test suite 
so that it actually checks the output.

Also, this changes 'push' so that it only remembers the push location 
after connecting to the branch (but before it actually pushes 
revisions). That way if you fail to push because of a typo, it isn't 
remembered. But if you fail because you are out of date, you can fix 
that and not have to type it again.

That was the basic conclusion from the bug.

Seeking a +1.

John
=:->
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