scripts: use https url for redmine

scripts: use https url for redmine

This resolves an error I came across:

	(venv-redmine) pdonnell@senta02 ~/ceph$ python3 src/script/backport-create-issue --key 46ba4c140bd62d25ca83a6f0d40f06ef1a4384d0 37531
	WARNING:root:Missing issues will be created in Backport tracker of the relevant Redmine project
	INFO:root:Redmine key was provided; using it
	Traceback (most recent call last):
  	  File "src/script/backport-create-issue", line 242, in <module>
    	    project = redmine.project.get(project_name)
  	  File "/home/pdonnell/venv-redmine/lib/python3.5/site-packages/redminelib/managers/base.py", line 83, in get
    	    return self.to_resource(self.redmine.engine.request('get', self.url, params=self.params)[self.container])
  	  File "/home/pdonnell/venv-redmine/lib/python3.5/site-packages/redminelib/engines/base.py", line 76, in request
    	    return self.process_response(self.session.request(method, url, **kwargs))
  	  File "/home/pdonnell/venv-redmine/lib/python3.5/site-packages/redminelib/engines/base.py", line 138, in process_response
    	    raise exceptions.HTTPProtocolError
	  redminelib.exceptions.HTTPProtocolError: Redmine url should start with HTTPS and not with HTTP

Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>