remove FlagSet

[kamilsk]

• remove the method from interface

  semaphore/cmd/semaphore/cli.go

  Lines 28 to 29 in 1e58f96

  	// FlagSet should return configured FlagSet to handle command arguments.
  	FlagSet() *flag.FlagSet

• extend the method to accept arguments

  semaphore/cmd/semaphore/cli.go

  Line 35 in 1e58f96

  Do() error

• extend the method to return parsed arguments

  semaphore/cmd/semaphore/cli.go

  Line 42 in 1e58f96

  func (l Commands) Parse(args []string) (Command, error) {

• these parts

  semaphore/cmd/semaphore/cli.go

  Line 80 in 1e58f96

  Flags *flag.FlagSet

  and

  semaphore/cmd/semaphore/cli.go

  Line 105 in 1e58f96

  args := c.FlagSet().Args()

  should be removed
• these parts

	if c.Flags == nil {
		c.Flags = c.BaseCommand.FlagSet(c.CmdName)
		c.Flags.BoolVar(&c.Edit, "edit", false, "switch to edit mode to read arguments from input (not implemented yet)")
	}
	return c.Flags

should be refactored to stateless

[kamilsk]

moved to octolab/parallel#2