change the sting to match in ActionFiche

the new string sent from the client is call_form_result
rename the class ActionFiche to CallFormResult
rename files action_fiche to call_form_result
Merge remote-tracking branch 'origin/4539-call_form_result'

Conflicts:
	xivo-ctid/xivo_cti/cti/commands/call_form_result.py
	xivo-ctid/xivo_cti/cti/commands/tests/test_call_form_result.py