openonuAdapterGo: Tests for voltctl command to show ONU OMCI counter statistics

Create or expand existing test to check ONU OMCI counter statistics for MIB downloading.

• test have to be executed in baseline as well as in extended OMCI messages format
• check counter for baseline frames
• check counter for extended frames
• compare both, counter of baseline and extended frames

Create or expand existing test to check ONU OMCI counter statistics for SW Upgrade.

• test have to be executed in baseline as well as in extended OMCI messages format
• check counter for baseline frames
• check counter for extended frames
• compare both, counter of baseline and extended frames

Create or expand existing test to check ONU OMCI counter statistics for Retries

• check counter for Retries

Create or expand existing test to check ONU OMCI counter statistics for Timeouts

• check counter for Timeouts