[SPARK-11859][Mesos] SparkContext accepts invalid Master URLs in the form zk://host:port for a multi-master Mesos cluster using ZooKeeper#9886

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toddwan wants to merge 3 commits intoapache:masterfrom

Commits on Nov 21, 2015

SparkContext accepts invalid Master URLs like 'zk://host:port' for a multi-master Mesos cluster using ZooKeeper
toddwan
committed

Commits on Nov 24, 2015

Warn when the given mesos Master URL starts with zk://
toddwan
committed

Commits on Nov 25, 2015

Fix style test error & explicit warning message
toddwan
committed