Fix provision parsing error w/ manual sync while roaming

* We weren't retrieving the value for "sync manually when roaming"
  and this caused a bunch of issues when parsing policies
* We also weren't handling unsupportable policies properly (i.e.
  returning null and setting the array of strings representing
  those policies.

Bug: 4987267
Change-Id: I7cda6cad5c4455fff0d7c87518c1dbdedb271191
2 files changed