Container start up can be very slow on some systems

[electrofelix]

Gerrit startup can be quite dependent on the underlying host providing a decent amount on entropy. This can be problem on headless machines and is described at, davido/gerrit-oauth-provider#40 (comment) however it's not limited to using the oauth plugin and can affect usage involving the H2 DB as well, and subsequently and connections over SSH.

Figured it might be worth adding a note to the README.md to give users a heads up and point them in the direction of various solutions.

Will try to follow up with a PR