Per-plan trial period
Summary:
Per-plan lite period
Don't send end-of-trial notifications if free_months != 1
Test Plan: ./phpunit
Reviewers: #hkccp_developers, mollekopf
Reviewed By: #hkccp_developers, mollekopf
Subscribers: mollekopf, #hkccp_developers
Differential Revision: https://git.kolab.org/D3833