[py2py3] Remove/replace dependency on restkit library

[mapellidario]

Impact of the new feature

WMCore in general, and perhaps other services depending on it.

Is your feature request related to a problem? Please describe.

Some packages built from dmwm/WMCore depend on restkit ( pypi, specfile ), which only supports python2.

List of dmwm/WMCore packages depending on restkit

• WMagent. restkit is imported by couchapp, which is imported by couchdb15.
• ReqMgr2. restkit is imported by couchapp, which is imported by couchdb15.
• Workqueue.restkit is imported by couchapp, which is imported by couchdb15.
• ACDCServer. restkit is imported by couchapp, which is imported by couchdb15.

Describe the solution you'd like

The issue about support for python3 in restkit is still open after 9 years. It seems unlikely that this changes soon.

I am not sure what the solution may be, I may need some help from other members of the team.

[amaltaro]

@mapellidario as we discussed in the past week, I'm setting this issue free such that others can pick it, if they want.

[amaltaro]

This cmsdist PR: cms-sw/cmsdist#6892
deprecates the restkit and couchapp spec files, bringing in a new dependency on CMSCouchapp (which internally depends on the requests library).

It's been tested and Couchapps and jenkins are happy with the new package (I'm still working on another version to make it less DEBUG verbose though, to be fixed in the couchapp issue).

Having said that, I consider this issue done and it can be closed.