Fix loadbalancing in Chef deployment with multiple CAEs

When the Chef deployment was configured to install multiple CAEs on a single node for loadbalancing purposes, the servlet context was missing in the proxy balancer config.

(CMS-16807)

MySQL Deployment in Chef used deprecated configuration syntax

Since MySQL 5.7, the correct syntax uses underscrores _ instead of hyphens - .

(CMS-16408)

Solr cookbook in Chef deployment fails to update

The home directory of the solr user can only be changed to the new solr installation directory, when the service is stopped. With Chef you can model this by using the :before timing on a stop notification to the service resource.

(CMS-12223)