Document ActiveMQ memory requirements
Description
ActiveMQ may need more heap allocated, otherwise it may run out of memory under heavy load:
https://groups.google.com/a/opencast.org/forum/#!topic/users/aLj-ZK6doOM
Update the max heap setting from 1024m to 2048m in /opt/activemq/bin/linux-x86-64/wrapper.conf (ActiveMQ may not be installed in the same place):
Fixed and reviewed
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