Helper: dcos_cluster_address
Helper: dcos_cluster_address

Include a new helper method to get the address to a DC/OS cluster
for sending API calls or CLI commands. Use `leader.mesos` as the
default address if we're not configured with either an external
load balancer on the masters or a configured master list. This can
be useful for cases where you may want to install local tools to
run against a remote cluster.

Signed-off-by: Chris Gianelloni <ef2880787b7c7d40508a6b0a5368add313fc9ad5@gmail.com>

chef-partners/dcos-cookbook,chef-partners/dcos-cookbook,chef-partners/dcos-cookbook