etcdctl: Set watch consistency to STRONG
*: rename initial-cluster-name to initial-cluster-token
etcdctl: remove SetConsistency call

This call to SetConsistency is explicitly setting the default
value, so it's really unnecessary.
Merge pull request #1511 from coreos/set-watch-consistency-to-strong

etcdctl: Set watch consistency to STRONG
doc: add doc for initial-cluster-token
Merge pull request #1537 from xiangli-cmu/cluster-token

Cluster token
etcdhttp: fix logging in raft handler
Merge pull request #1542 from xiangli-cmu/fix_logging

etcdhttp: fix logging in raft handler
etcdserver: fix sender logging
Merge pull request #1543 from xiangli-cmu/fix_logging

etcdserver: fix sender logging
*: clean log.Print

1. only log things by default that the operator of etcd may need to react to
2. put package name at the head of log lines