lvm: check if a device exists before making the group
lvm: check if a device exists before making the group

CiscoCloud/microservices-infrastructure,phnmnl/mantl,mantl/mantl,abn/microservices-infrastructure,mantl/mantl,datascienceinc/mantl,phnmnl/mantl,KaGeN101/mantl,sehqlr/mantl,bitium/mantl,huodon/microservices-infrastructure,CiscoCloud/mantl,abn/microservices-infrastructure,ContainerSolutions/microservices-infrastructure,huodon/microservices-infrastructure,ContainerSolutions/microservices-infrastructure,abn/microservices-infrastructure,CiscoCloud/microservices-infrastructure,huodon/microservices-infrastructure,KaGeN101/mantl,huodon/microservices-infrastructure,huodon/microservices-infrastructure,datascienceinc/mantl,bitium/mantl,CiscoCloud/mantl,sehqlr/mantl