Fix problem where on service start the filename is S20metricproxy.pid and subsequent starts look for metricproxy.pid
Fix problem where on service start the filename is S20metricproxy.pid and subsequent starts look for metricproxy.pid

if6was9/metricproxy,if6was9/metricproxy,baris/metricproxy,zvelo/metricproxy,signalfx/metricproxy,signalfx/metricproxy,baris/metricproxy,zvelo/metricproxy