Add ability to snapshot replicating primary shards

This change adds a new cluster state that waits for the replication of a shard to finish before starting snapshotting process. Because this change adds a new snapshot state, an pre-1.2.0 nodes will not be able to join the 1.2.0 cluster that is currently running snapshot/restore operation.

Closes #5531
[TEST] Disable dummy documents for QueryRescorerTests#testEquivalence
Benchmark abort accepts wildcard patterns

This adds support for sending a list of benchmark names and/or wildcard
patterns when submitting an abort request. Standard wildcards such as:
"*", "*xxx", and "xxx*" are supported. Multiple benchmark names and
wildcard patterns can be submitted together as a comma-separated list
from the REST API or as a string array from the Java API.

Closes #6185