Ensure that current timestamp is newest
Ensure that current timestamp is newest

This step is specified in the design doc and ensure monotonically increasing
timestamps.

Signed-off-by: mulhern <7b51bcf507bcd7afb72bf8663752c0ddbeb517f6@redhat.com>

stratis-storage/stratisd,stratis-storage/stratisd,stratis-storage/stratisd,trgill/stratisd,mulkieran/stratisd,trgill/stratisd,mulkieran/stratisd