[patch, testsuite] Fixes for gdb.python tests on remote Windows host

[Sandra Loosemore]

The attached patch fixes a bunch of FAILs and ERRORs I've seen in 
gdb.python tests running on remote Windows host.  As noted in the commit 
message, the fixes are mostly obvious and repetitive;  e.g., remember to 
copy the .py script to the remote host before trying to source it. 
Since this is a pretty big patch, though, I wasn't sure the whole thing 
qualifies as "obvious", and wanted to give folks a chance to object 
before I check it in.  So I propose to push it to trunk in a week if I 
don't hear any objection or review (or promise to review) meanwhile.

-Sandra
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