Example conn.network.create_security_group_rule() in examples/network/security_group_rules.py
uses wrong protocol type protocol='HTTPS'. HTTPS is not allowed value,
allowed values are: icmp, udp, tcp. It should be "protocol='tcp'" instead.
Closes-Bug: #2052860
Change-Id: I0fb0532ca562bcf93672a1ca3f1ce2e3ad864c6d