Removed duplicate keys in dicts in test

Removed duplicate keys in dicts in test

Test test_create_security_group_rule_invalid_ethertype_for_prefix
contained dict with duplicate keys, remote ip prefixes.

Test was successful because incorrect items for tests were overwitten:

'192.168.1.1/24': 'ipv4'  by '192.168.1.1/24': 'IPv6'
'2001:db8:1234::/48': 'ipv6' by '2001:db8:1234::/48': 'IPv4'

This patch removes incorrect and useless items for tests.
Also added additional item with invalid ethertype.

Change-Id: I29cd2b843a7905986de13a1ecfba0cb5797ccaf8