Fix -raftHashicorp and -raftBootstrap flag propagation. (#4309)
`weed server` was not correctly propagating
`-master.raftHashicorp` and `-master.raftBootstrap` flags when
starting the master server.
Related to #4307
masterOptions.raftBootstrap=cmdMaster.Flag.Bool("master.raftBootstrap",false,"Whether to bootstrap the Raft cluster")
masterOptions.heartbeatInterval=cmdServer.Flag.Duration("master.heartbeatInterval",300*time.Millisecond,"heartbeat interval of master servers, and will be randomly multiplied by [1, 1.25)")
masterOptions.electionTimeout=cmdServer.Flag.Duration("master.electionTimeout",10*time.Second,"election timeout of master servers")