Merge pull request #211 from ssbunyk/develop

ZEN-13183 fix.
Fixed reporting missing counters, added check for data processing

We can not barely rely on the first command when getting the number of
samples received, as they may be received in different order. Therefore report missing counters after max_samples value is reached.
Merge remote-tracking branch 'zenoss/develop' into develop
Merge pull request #212 from ssirushchyshyn/develop

Fixed reporting missing counters, added check for data processing
Improved code for ZEN-11583 issue
Merge pull request #215 from ssOleg/develop

Improved code for ZEN-11583 issue
ZEN-11384, serialize to JSON in powershell 2.0
Merge remote branch 'zenoss/develop' into develop