testrunner: added bug fetching script

bugs can be queried in cron job using
./manage update_bugs
Fetching bugs from bugzilla and jira is done with the list. Fetching
launchpad bugs is done one by one due to API limitations.

Signed-off-by: Milosz Wasilewski <milosz.wasilewski@linaro.org>
Merge branch 'master' of https://github.com/mwasilew/testmanager