Fix for warning alert while checking array

Weekly/monthly checks on large arrays take quite a long time leaving it in a warning status while it executes.

This change prevents a checking array from returning a warning.

If there is an inconsistency detected while the check is running you will receive a "resync=delayed" and warning return code, otherwise the check will return OK.
Merge pull request #23 from mshirley/raid_check

Fix for warning alert while checking array