Delete unused dependencies in DataWorkflow. CAF-165
Replacing deprecated sha with hashlib.sha1 - fixes CAF-160
Explicitely setting key/cert for site db decorator calls. CAF-184
Changing TaskDB import path for CAF-147
Merge pull request #3986 from mmascher/delete-unused-imports

Delete unused dependencies in DataWorkflow. CAF-165
Merge pull request #3987 from cinquo/master

Replacing deprecated sha with hashlib.sha1, explicitly setting key/certs for SiteDB cals, changing imports to support filemetadata