Ben Higgins 3d51b92648 vault: recover from standby losing etcd lease (#3031) (#3511)
This change makes these errors transient instead of permanent:

[ERROR] core: failed to acquire lock: error=etcdserver: requested lease not found

After this change, there can still be one of these errors when a
standby vault that lost its lease tries to become leader, but on the
next lock acquisition attempt a new session will be created. With this
new session, the standby will be able to become the leader.
2017-11-03 13:38:16 -04:00
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