This metric reflects the user experience of pushing to Gerrit. Add a
new push type "NORMAL" to distinguish AUTOCLOSE from Gerrit serving
standard git push (which should be much faster).
Put the CREATED and REPLACED stats in the change counter together as
CREATED_REPLACED to mirror the latency metrics.
Change-Id: I1aae3bc0c0fe430086221503b8e529fa06967517
44b6e767fa