In case of inproper argument passing, the tool will panic

[filipecosta90]

Given on line 94, there is no check for the slice length:

globalProps.Set(seps[0], seps[1])

in case of improper argument passing:

Example:

./bin/go-ycsb load redis  -p recordcount=10000 -p threadcount 4

the tool will panic:

$ ./bin/go-ycsb load redis  -p recordcount=10000 -p threadcount 4
panic: runtime error: index out of range [1] with length 1

goroutine 1 [running]:
main.initialGlobal({0x7ffe6908663f, 0x5}, 0xc0007bfb00)
        /home/fco/redislabs/go-ycsb/cmd/go-ycsb/main.go:94 +0x61b
main.runClientCommandFunc(0x795ee0?, {0xc0005e82a0?, 0xc0007bfcd0?, 0x0?}, 0x0?)
        /home/fco/redislabs/go-ycsb/cmd/go-ycsb/client.go:30 +0x90
main.runLoadCommandFunc(0xc000579b80?, {0xc0005e82a0?, 0x6?, 0x6?})
        /home/fco/redislabs/go-ycsb/cmd/go-ycsb/client.go:66 +0x25
github.com/spf13/cobra.(*Command).execute(0xc000579b80, {0xc0005e8240, 0x6, 0x6})
        /home/fco/go/pkg/mod/github.com/spf13/cobra@v1.0.0/command.go:846 +0x663
github.com/spf13/cobra.(*Command).ExecuteC(0xc000579340)
        /home/fco/go/pkg/mod/github.com/spf13/cobra@v1.0.0/command.go:950 +0x39c
github.com/spf13/cobra.(*Command).Execute(...)
        /home/fco/go/pkg/mod/github.com/spf13/cobra@v1.0.0/command.go:887
main.main()
        /home/fco/redislabs/go-ycsb/cmd/go-ycsb/main.go:172 +0x22c