Provide the manual-test urls twice: once before set-default and once after.

Summary:
That way, you can (more) easily test everything is ok before even
setting default, and then test again if you want, to make sure there
are no weird issues with the default.

Get rid of some double-slashes in urls, and test the hipchat message.

Add quotes around the 'open' command, since some url's have a '?' in them.

Test Plan:
Fingers crossed.  Will monitor a deploy after this is in.

I ran, in the webapp directory:

  env PYTHONPATH=.:tools ../jenkins-tools/deploy_pipeline.py acquire-lock --lockdir=$HOME/tmp/deploy.lockdir --deployer_email=csilvers@ka.org --git_revision=csilvers --auto_deploy=false --jenkins_url=http://jenkins.khanacademy.org/ --hipchat_room=HipChat\ Tests --hipchat_sender=Mr\ Gorilla --deploy_email=prod-deploy@khanacademy.org --deploy_pw_file=/var/lib/jenkins/prod-deploy.pw

I then modified deploy_pipeline.py to remove the POSSILBE_NEXT_STEPS
test at the beginning of main(), and ran

   env PYTHONPATH=.:tools ../jenkins-tools/deploy_pipeline.py manual-test

and saw it print a reasonable (albeit long!) message to hipchat.  I
clicked on some of the links and they properly took me to the
non-default pages they were supposed to.

(same)

Reviewers: benkomalo, alan

Reviewed By: alan

Differential Revision: http://phabricator.khanacademy.org/D13840