[scripts] a tool to print out HybridTime timestamps
[scripts] a tool to print out HybridTime timestamps

This is Todd's script to output HybridTime timestamps in human-readable
form (works with Python2 and Python3).  The script reads from standard
input until EOF/EOS and outputs the result into standard output.

The script is useful when analyzing hybrid timestamps found in Kudu
WAL files.  For example:

$ echo 6435399373400084500 | python convert-hybrid-timestamp.py
2019-10-15 05:27:05.146505 L=20

Change-Id: Ifc5b0d20c6f1bca0994d00a347ff14e4ae64a14c
Reviewed-on: http://gerrit.cloudera.org:8080/14541
Tested-by: Alexey Serbin <864f6b82bd94e8dda64141d4274519ee66e0102e@cloudera.com>
Reviewed-by: Bankim Bhavsar <3aac13853bde1b179487acd91435d1ded94913cb@cloudera.com>
Reviewed-by: Andrew Wong <b68e4fdc6430321a6b47400732ff97d7ae91234e@cloudera.com>

helifu/kudu,helifu/kudu,helifu/kudu,helifu/kudu,helifu/kudu,helifu/kudu,helifu/kudu,helifu/kudu,helifu/kudu