autotest: Minor site_linux_router refactor

Expose the create method of LinuxRouter without forcing every
caller to continue passing dictionaries that only take a single
parameter.  While in there, clean up quotation marks, some imports,
and add some comments.  This removes just a few of the many warnings
that we're getting on each and every commit.

TEST=Ran network_WiFiMatFunc/007CheckPS which calls create()
BUG=None

Change-Id: I3453f7c36f6caac6fa045d2244dce40babe8a420
Reviewed-on: https://gerrit.chromium.org/gerrit/47282
Tested-by: Christopher Wiley <wiley@chromium.org>
Reviewed-by: Paul Stewart <pstew@chromium.org>
Commit-Queue: Christopher Wiley <wiley@chromium.org>
1 file changed