Ignore std error on version discovery

git may print warnings out that can confuse the parsing, and std error
could never provide a trustworthy errorn number anyway. (In my case, it
was providing a tag name which provided a valid but undesirable match,
so I was ending up with the wrong version number)

Change-Id: I61bccacfff20fd4afd8ac8d73b69e2deab50d1c7
Fix "proeprty" typo
Fix PATCHLEVEL -> LEVEL typo
Uses XML output format of svn info to fetch url

Regex was used with svn info output to fetch url value in
SVN._sourcedirIsUpdatable. French and Norvegian svn versions use
respective language names for url value and not 'URL' in regex.
XML Output format of svn info resolves it

Fixes http://trac.buildbot.net/ticket/2375
Fixes svn tests to match url value in XML output format of svn info
db_poller isn't getting adjusted

At the time we call def reconfigService(self, new_config):
self.config.db['db_poll_interval']  has the new value already assigned,
so this comparison is never true
https://github.com/buildbot/buildbot/blob/master/master/buildbot/master.py#L303
if (self.config.db['db_poll_interval']   !=
new_config.db['db_poll_interval'])

and the db_poller isn't getting adjusted, changed the reconfigService
implementations to store initial configuration in object attributes, and
compare those attributes to new_config.
code review fixes

- change configured_url -> configured_db_url
- put all of the config-handling code in reconfigService
- add release notes
Handle multiple codebases in Grid and Transposed Grid views
Merge branch 'et_setup_version' of git://github.com/jgonzalezmendez/buildbot
Merge branch 'typos' of git://github.com/vrutsky/buildbot
Merge branch 'multiple_codebases_grids_view' of git://github.com/vrutsky/buildbot
change tests to correspond
Merge branch 'pull639'
Merge branch '2375fix' of git://github.com/ShriramK/buildbot
pyflakes