* docker app: polling - RRD dataset and fields value mismatch
RRD dataset definitions and fields array keys passed to data_update
have to be in the same order. There is no match based on key before
building the rrdtool update command.
Fixes mem_perc ending as NaN because it ended with a value above 100
as it was given mem_limit bytes value.
* docker app - remove misleading divider
The mem_perc and cpu_usage are already in percent, no need to divide
them by a hundred. The values were then made into milli percent or micro
percent.
