Improving server_info

Improving server_info object by parsing the db* keys of redis-info.
earlier it was
server_info = { .. 
 db0: 'keys=1,expires=0,avg_ttl=0',
  db9: 'keys=49,expires=49,avg_ttl=2588996447',
.. }
changed this to
server_info = { ..
  db0: { keys: '1', expires: '0', avg_ttl: '0' },
  db9: { keys: '49', expires: '49', avg_ttl: '2588996447' }
..}