Implemented feature to add new attributes to existing Openshift allocations

[QuanMPhm]

Closes #200. Built on top of #201. This PR consists of the last commit. validate_allocations will now check if an Openshift allocation does not have a quota value set on either the Coldfront or Openshift side. In this case, it will set the default quota value for the allocation.

Due to the complexity of Openstack quotas, this feature is only
implemented for Openshift allocations for now.

[naved001]

looks like a good feature to have. Just a question inline

[QuanMPhm]

@naved001 @knikolla This has been rebased and updated, and now has priority because the IBM Storage PR will now be built on it.

[knikolla]

Looks good to me.

Some comments that don't need to be fixed now:

• I don't love that the behavior of validate_allocations between OpenStack and OpenShift is now different. We should try to factor out the commonalities and implement features like this in an agnostic way.
• Could the else have been replaced with an elif to keep the depth of the conditional statements flatter?

[QuanMPhm]

Could the else have been replaced with an elif to keep the depth of the conditional statements flatter?

@knikolla Hilariously enough, @naved001 has already asked a similar question before. I'll try to refactor this code block within this year. I could use elif, but it would lead to some repeated code :P

[knikolla]

Could the else have been replaced with an elif to keep the depth of the conditional statements flatter?

@knikolla Hilariously enough, @naved001 has already asked a similar question before. I'll try to refactor this code block within this year. I could use elif, but it would lead to some repeated code :P

Ah, makes complete sense.

I had a similar moment of understanding before I left on vacation, which I clearly forgot when coming back.