Change "us" time  precision in lma_utils to "u"

InfluxDB expects "u" precision for microseconds, but lma_utils
uses a "us" precision for it. In this patch I sync these precision names,
because otherwise influxdb output writes records with
invalid time to InfluxDB.

Change-Id: I0bf50c6f80faa4bc434a4a7efc01113dd7869dae
2 files changed