Add MetricsSwitch to switches
Change safeState to off
Push metrics when we are PROD or the switch is on
Remove latencyMetrics and add into applicationMetrics
Remove JsonParsingErrorCount, ElasticContentApiCalls and
ElasticContentApiTimeouts
Remove ContentApiJsonParseExceptionMetric,
ContentApiJsonMappingExceptionMetric InvalidContentExceptionMetric
Remove unused metrics from facia-tool
Merge branch 'metrics-switch'

Conflicts:
	common/app/conf/switches.scala
Merge remote-tracking branch 'origin/master'