removed unnecessary fmt.Sprintf, renamed flag to JoinValidatorSetFlag, and elaborated on its usage

Former-commit-id: 7e98ed54ff716b2da878f085ae1ff40472ce1966 [formerly fc5b4ec6ab005aedf8d0aa3206f27209aab65d71]
Former-commit-id: 4b17e2e49cf3df95a90be3fc7fb2bb66a96bbeed

cmd/geth/main.go

@@ -122,7 +122,7 @@ var (
 		utils.GpoBlocksFlag,
 		utils.GpoPercentileFlag,
 		utils.ExtraDataFlag,
-		utils.ValidatorSetFlag,
+		utils.JoinValidatorSetFlag,
 		configFileFlag,
 	}
 

cmd/geth/shardingcmd.go

@@ -14,7 +14,7 @@ var (
 		Aliases:   []string{"shard"},
 		Usage:     "Start a sharding client",
 		ArgsUsage: "[endpoint]",
-		Flags:     []cli.Flag{utils.DataDirFlag, utils.PasswordFileFlag, utils.NetworkIdFlag, utils.IPCPathFlag, utils.ValidatorSetFlag},
+		Flags:     []cli.Flag{utils.DataDirFlag, utils.PasswordFileFlag, utils.NetworkIdFlag, utils.IPCPathFlag, utils.JoinValidatorSetFlag},
 		Category:  "SHARDING COMMANDS",
 		Description: `
 Launches a sharding client that connects to a running geth node and proposes collations to a Validator Manager Contract. This feature is a work in progress.

cmd/utils/flags.go

@@ -539,9 +539,9 @@ var (
 	}
 
 	//Sharding Settings
-	ValidatorSetFlag = cli.BoolFlag{
+	JoinValidatorSetFlag = cli.BoolFlag{
 		Name:  "validator",
-		Usage: "Join validator set",
+		Usage: "To become a validator with your sharding client, 100 ETH will be deposited from user's account into VMC ",
 	}
 )