pmdahacluster: Correct config_last_change to UTC (v2)
pmdahacluster: Correct config_last_change to UTC (v2)

Correct the pacmaker.config_last_change metric to output the value of the
pacmaker configuration last change data as a representation of seconds from
Epoch in UTC.

We make use of the IEEE general concept of calculating Seconds Since the
Epoch from a time_t in localtime as outlined in:
https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap04.html

This should correct the non-deterministic issue with QA 1897 in different
time-zones without needing any QA changes.

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp