When upgrading a primary server, full synchronization is not happening as expected

[TheWitness]

Describe the bug
Part of the upgrade process forces a remote full syncronization to all data collectors. This is not happening though.

To Reproduce
Steps to reproduce the behavior:

1. Setup a remote data collector off of a primary server
2. Upgrade the primary server to the latest Cacti
3. Not that the install log states that there were no data collectors to sync to

Expected behavior
Cacti should synchronize all remote data collectors.