autotest: Make params optional for site_linux_router deconfig/destroy

This lets us not pass empty dictionaries about in future tests.

TEST=Ran network_WiFiMatFunc/000Check11b which performs both operations.
BUG=None

Change-Id: Ic1bf328391bdaec34fc4eacd16ce160a517b1e7d
Reviewed-on: https://gerrit.chromium.org/gerrit/47810
Tested-by: Christopher Wiley <wiley@chromium.org>
Reviewed-by: Paul Stewart <pstew@chromium.org>
Commit-Queue: Christopher Wiley <wiley@chromium.org>
1 file changed