Create server manager for workers

[tanishq-dubey]

As stated in #2 , there will exist worker daemons for managing each worker locally, however a head-node manager must exist as well. The head node manage will do the following tasks:

• Keep a list of worker nodes
• Send message to worker daemons for creating/destroying containers
• Keep a list of container swarms

A communication protocol will need to be decided between the workers and the head-node .