This update ensures forward slashes are alow used for classpath
resolution, even on all Windows versions. Also add extra validation
to prevent path separators (slashes) in factory key names. Lastly added
some more tests for validation

This closes #1830

(cherry picked from commit bedb108)

This prevents a VM transport URI from being used when adding a connector
or a network connector through the Broker MBean

(cherry picked from commit ef53b5b)

Add a check for VM transports that are in a nested composite URI

This is a follow on to #1840

(cherry picked from commit 70caa1b)