sensor: Modify the Get sensor reading command

a) Scanning is enabled for all sensors, otherwise ipmitool would
   report the sensors as disabled.
b) Correct the error handling scenario which will occur when the
   D-Bus object is not present or error occurs when reading the D-Bus
   property.

Change-Id: I49535663a242305ab02a67f8f5998647cfee7eee
Signed-off-by: Tom Joseph <tomjoseph@in.ibm.com>
1 file changed