Speficies the validity of the entry.
If the 'Config Control Status' for entry '0' is made 'valid',
then global control is chosen in the system.
It signifies that the values against entry '0' is applicable
for all the interfaces of the switch.
If the 'Config Control Status' for entry '0' is made 'invalid',
then interface-wise control is chosen.
Then the values against each interface index is applicable
for that interface.
By default, 'sysConfigCtrlStatus' will be 'invalid' for
entry '0' and 'valid' for all other entries.
(ie) by default, interface-wise configuration is enabled
in the system.
The status of entries other than the zeroth(0th) entry can not be
made 'invalid'.