Stop emit default value for counter TotalError and ReaderRestartProcessing

[yujias0706]

Fixes #:

Description of changes:

TotalError and ReaderRestartProcessing will stop showing in service log entry counter if the value is 0
Add default MethodName CollectStatsMetric when MethodName is not provided

Tests:

Tested on AES domain

------------------------------------------------------------------------
Marketplace=yujias-swift-dev
ClientProgram=356098247920:heat-profile-test-1
Program=PerformanceAnalyzerAgent
ESVersion=7.10
rca-version=0.0.1
MethodName=CollectStatsMetric
StartTime=1615870841.554
EndTime=Mon, 15 Mar 2021 22:01:41 PDT
Time=59967 msecs
Timing=total-time:59967.0/1
Counters=TotalError=24,ReaderRestartProcessing=12,Other=12
EOE
------------------------------------------------------------------------
Marketplace=yujias-swift-dev
ClientProgram=356098247920:heat-profile-test-1
Program=PerformanceAnalyzerAgent
ESVersion=7.10
rca-version=0.0.1
MethodName=CollectStatsMetric
StartTime=1616104904.061
EndTime=Thu, 18 Mar 2021 15:02:44 PDT
Time=59990 msecs
Timing=total-time:59990.0/1
Counters=
EOE
------------------------------------------------------------------------
Marketplace=yujias-swift-dev
ClientProgram=356098247920:heat-profile-test-1
Program=PerformanceAnalyzerAgent
ESVersion=7.10
rca-version=0.0.1
MethodName=ProcessMetrics
StartTime=1616108464.409
EndTime=Thu, 18 Mar 2021 16:01:04 PDT
Time=21 msecs
Timing=total-time:21.0/1
Counters=
EOE

If new tests are added, how long do the new ones take to complete