Queue active sensor updates before status objs created

If an OCC Active sensor update comes in before the Status objects have
been created, the value is lost.  This commit will save that sensor
value until the status objects are created.
Also, prevent querying the master sysfs file if OCCs are not yet activated.

Change-Id: I8c0d2686024278ec7435e19cf99f59802e1ecceb
Signed-off-by: Chris Cain <cjcain@us.ibm.com>
5 files changed