ipatests: ipa-adtrust-install command test scenarios
    
    This patch includes additional testcase that can be run
    against ipa-adtrust-install CLI tool.
    
    test_adtrust_install_with_incorrect_netbios_name
    test_adtrust_install_as_regular_ipa_user
    test_adtrust_install_with_incorrect_admin_password
    test_adtrust_install_with_invalid_rid_base_value
    test_adtrust_install_with_invalid_secondary_rid_base
    test_adtrust_reinstall_updates_ipaNTFlatName_attribute
    test_adtrust_install_without_ipa_installed
    test_samba_credential_cache_is_removed_post_uninstall
    test_adtrust_install_without_integrated_dns
    test_adtrust_install_with_debug_option
    test_adtrust_install_cli_without_smbpasswd_file
    test_adtrust_install_enable_compat
    test_adtrust_install_invalid_ipaddress_option
    test_syntax_error_in_ipachangeconf
    test_unattended_adtrust_install_uses_default_netbios_name
    test_smb_not_starting_post_adtrust_install
    
    Signed-off-by: Sudhir Menon <sumenon@redhat.com>
    Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>