Read environment variable to set activemq max connections

[pedrocatalao]

The environment variable DOVETAIL_AMQ_TCP_MAXIMUM_CONNECTIONS is already available inside the broker container. It shall be read during loading to set AMQ max connection to that value.

[skin27]

From tomorrow the maximum connections can be set on the Assimbly backend container with the environment variable: AMQ_MAXIMUM_CONNECTIONS I would propose the following: xlarge --> 500 2xlarge --> 1000 4xlarge --> 1500 Note when nothing is set 500 is used.