SERVER-5092 support log tags for LOG() messages
SERVER-5092 added server parameters for tag log levels
SERVER-5092 tagged storage and networking LOG() messages
SERVER-14097 SERVER-14098 execution-level explain for .find() and .count()

The explain implementation for .find() and .count() is feature complete. To use
the .find() implementation, set the enableNewExplain setParameter to true.

Count operations are explained through the new explain command, e.g.
db.runCommand({explain: {count: "coll", query: {foo: "bar"}}}).
Revert "SERVER-13961 Remove TLS LockState accesses from repl"

This reverts commit e1dca2cdeed7cf5549a85d487def752d600af244.
Merge remote-tracking branch 'upstream/master'