sockets: Implement status command for all sockets

This command will return the status of the system including;
 * last apt cache change
 * Last git commit
 * Number of Python threads and Python memory usage
 * Filesystem usage

And it will return the status of all the socket server active on the
system. Socket status is determined by time since last activity.
sockets: Change default values to 0.0
test/sockets: Added test for status and activity monitoring and clean up