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

[Michael Pasternak]

- 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


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Michael Pasternak
RedHat, ENG-Virtualization R&D