[Users] new ovirt-engine-cli features (form 3.1 till now)

- support utf-8 encoding - do not log /connect command in history - disable /history while not connected - add username/password prompt/command-line functionality - history command does not support pipe redirection #854486 - valid UUIDs are treated as syntax error #854391 - Rename /delete command with /remove #855769 - Raise an error if identifier is not specified in /show command #855750 - remove --show-all option from /show command #855749 - rename "create" command with "add" #855773 - change NoCertificatesError message to ask only for ca_file - implement /filter flag - do not write to file i/o during script execution - shell does not exit when using /exit/ command in script -- Michael Pasternak RedHat, ENG-Virtualization R&D