timeout in testing scripts ignores the days if set to greater than 24 hours

[Hemanth Nakkina]

The following testing script gets TIMEDOUT in 10 minutes.

Expectation is to run successfully or time out after 1 day 10 minutes. (24:05:00 from script + 5 min grace period in timeout in maas)

# --- Start MAAS 1.0 script metadata ---
# name: shouldfail5m
# title: CPU validation
# description: Run stress-ng memory tests for 12 hours.
# script_type: test
# hardware_type: cpu
# packages: {apt: stress-ng}
# timeout: 24:05:00
# --- End MAAS 1.0 script metadata ---

sudo -n stress-ng --aggressive -a 0 --class cpu,cpu-cache --ignite-cpu \
    --log-brief --metrics-brief --times --tz --verify --timeout 24h

Seems like the conversion of timeout datetime object in metadataserver code is ignoring the number of days [1]

[1] https://github.com/maas/maas/blob/master/src/metadataserver/api.py#L1251

[Hemanth Nakkina (hemanth-n)]

PR submitted for review: https://code.launchpad.net/~hemanth-n/maas/+git/maas/+merge/394615