[MERGE] (fixes 239523) bzr tag and other builtins respect --quiet

[Neil Martinsen-Burrell]

Following the trivial bug theme, but letting this one get a bit more out 
of hand, the attached patch makes everything in bzrlib/builtins.py that 
isn't an informational command respect the --quiet option (if it didn't 
already).  I added blackbox tests for --quiet where I made changes, but 
not across the board.

Note that a lot of this could have been avoided in one fell swoop by 
redefining self.outf depending on the is_quiet() options, but since "if 
not is_quiet()" seemed to be the idiom present in builtins.py, I 
followed it.  Certainly changing self.outf has farther reaching 
consequences than just these commands, but I figured I'd mention it.

-Neil

-- 
"Mathematicians create by acts of insights and intuition.  Logic then
sanctions the conquests of intuition."
   -- Morris Kline

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