container: added attribute comments for sc_url, aa_profile and cap_drop
container: add priority attribute
network: add priority attribute
node: add priority attribute
container: add some singleton priority helper methods
node: added method to shutdown all ssh connections
node: updated ssh methods documentation
provisioner: bind: only install bind on node provision
testlab: refactor log handling
testlab: refactor bugreport method
testlab: flush stacktrace dump; automatically call the bugreport task when we catch an exception
testlab: add support for parallel execution of lab actions
testlab: enable parallel execution of lab actions
cli: allow not operator '!' when supplying lists of container names via cli