fix issue that hang on call method Run('ps -ef | grep waagent') for some distros,use method RunUpdate() to replaced
fix issue that hang on call method Run('ps -ef | grep waagent') for some distros,use method RunUpdate() to replaced

konkasoftci/azure-linux-automation,iamshital/azure-linux-automation,konkasoftci/azure-linux-automation,FreeBSDonHyper-V/azure-freebsd-automation,FreeBSDonHyper-V/azure-freebsd-automation,v-sirebb/azure-linux-automation,v-sirebb/azure-linux-automation,Nidylei/azure-linux-automation,konkasoftci/azure-linux-automation,hglkrijger/azure-linux-automation,iamshital/azure-linux-automation,v-sirebb/azure-linux-automation,hglkrijger/azure-linux-automation,Nidylei/azure-linux-automation,FreeBSDonHyper-V/azure-freebsd-automation,Nidylei/azure-linux-automation,iamshital/azure-linux-automation,hglkrijger/azure-linux-automation