OAK-795: OSGi init issues

Remove the 64-bit default value of the tarmk.mode property.
If the property is unspecified, the system should auto-detect
the TarMK mode instead of always using a hardcoded default.

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1550532 13f79535-47bb-0310-9956-ffa450edef68