Restrict all jobs when the device is too hot.

Restrict all jobs (and not just connectivity jobs) when the thermal
status is SEVERE+.

Bug: 193269111
Test: atest frameworks/base/services/tests/mockingservicestests/src/com/android/server/job
Test: atest frameworks/base/services/tests/servicestests/src/com/android/server/job
Test: atest CtsJobSchedulerTestCases
Change-Id: Id8eed849dfeb26aca1c0743af974c9efadf7fb78