CRM-14423 - CiviUnitTestCase - Only run env checks, not security checks, during unit-tests.

The security checks are more I/O intensive.
Merge pull request #2820 from totten/4.4-tz-opt

CRM-14423 - CiviUnitTestCase - Only run env checks, not security checks, during unit-tests.
Merge remote-tracking branch 'upstream/4.4' into 4.4-master-2014-04-04-00-48-43