Adding a new variable to define the from address for subscription email

Support for 3.6 has been dropped from this conversation: https://github.com/actions/setup-python/issues/544

Add greenlet in requirements

Refactor ssh access agent

User would be removed from one or more groups according to the
list provided in msg, before they are added to one or more groups.

This change will support our design decision that a user should be only
part of a group that corresponds to his current state. Users are not in
two states at any given time, they have only one state. Likewise, they
should only be in one group at a time corresponding to their state (look
at rabbit_config.py)

Previously to block ssh access, user is put in nossh group by ssh_access
agent. This new design will make use of group_member agent that is part
of group management framework which puts a user in a group list provided.

Adding the else statement

Adding a check for version of cmsh being used, to use appropriate com…

Add workflow for pre_certification state for a user

Add exception handling to acctmr workflow agent

Use hold in place of blocked for state.

Feat handle input error acctmgr

If the user gives any state other than the three given choices,
throw an error and print usage help. This helps avoid unacked msgs
that are stuck in the workflow queue cause problems.

Add updated_by field to user_state table