Refactor the configuration of ports to auto select ports.

[nuxlli]

The azk uses several ports for communication of internal components:

5641   # spfs - p9fs server
5622   # ssh port to virtual machine
15680  # http balancer
5640   # rpc commands
5639   # realtime events

These ports may conflict with ports used by the user and that make the process too complicated for implementing agent.

Because these ports are just ports for communication of the components of AZK they do not necessarily need to be configured for any specific port.

[nuxlli]

In version 0.2.0 we started to use a different strategy: when azk agent starts it searches for available ports above port 11000.

Only in the case of Linux (running directly on the Docker) is that you must specify the port where the balancer should run.