Add /monitor endpoint for service health checks

[shmorri]

Customers often ask about endpoints that can be used for health checks for all services. We should add a /monitor endpoint that can easily check their status.

@yurem suggested the following options:

• Simple lightweight rest based ot servler based application (war)
• cgi-bin python script
• light python or node based server.
  This new service should be deployed by setup ( in enterprise edition to each server). It should gather status information about all installed services and return to client

[devrimyatar]

This application can be written with Gunicorn: https://gunicorn.org/
It is has no dependency on Ubuntu and CentOS containers, very light and extremely fast

[devrimyatar]

We can combine this issue and #102

[devrimyatar]

We have health check for all servers. A minimalist web application can both serve:
(1) As viewing health status of servers on /monitor
(2) And if server fails, starts automatically, and display stderr on web ui in case flailed to start

We can both use gunicron and bottlepy for this project. gunicorn is a general purpose wsgi web servers, whereas bottlepy is a single file and single threaded web framework. gunicorn needs installation of pypi package, but bottlepy does not. In my opinion bottlepy can be used for this project since /monitor endpoint won't need multiple access.