Description of problem:

Daily sync plan for a custom product;s repo was not synced 


Version-Release number of selected component (if applicable):
~]# rpm -q foreman
foreman-1.20.1.10-1.el7sat.noarch
~]# rpm -q tfm-rubygem-katello
tfm-rubygem-katello-3.10.0.24-1.el7sat.noarch


How reproducible:

Repeated fails when running:

tests/foreman/cli/test_syncplan.py::SyncPlanTestCase::test_positive_synchronize_custom_products_future_sync_date 


Steps to Reproduce:
1. Create a Daily sync plan with sync date and time in an hours time
2. make products
3. make repos yum for the products
4. Associate sync plan with products
5. Update sync time to be just a few minutes time

Actual results:

Repo is not synced at expected time


Expected results:

Repo is synced at expected time


Additional info:

[Bug 1685590] Next Sync time is not set on Products Repos details page