Fixing CARBON-14861- Able to query users with claim values in multiple user stores.
Merge pull request #54 from shamrath/CARBON-14861

Fixing CARBON-14861- Able to query users with claim values in multiple u...
Log appenders are moved to org.wso2.carbon.utils.logging.appenders package within the carbon utils bundle
getTenantAwareLogEvent method added to LoggingUtils which returns a TenantAwareLoggingEvent that wraps the passed LoggingEvent with tenant specific tenantId and serviceName
subAppend method is overriden to use the tenant aware logging event to append to the log
Negated exporting org.wso2.carbon.logging.appenders.internal package