If createDefaultInstanceSecurityGroupRules() method isn't extended
in its inheritors and SecurityGroups isn't created in application
with addGroupIngress() then no SecurityGroup is created by default.
It causes error in the NeutronNetworkBase class in its joinInstanceToNetwork()
method, which always attempt to update the OS::Neutron::Port resource with a
SecurityGroup attribute.
This patch fixes it.
Change-Id: I126e81e653799a83211e608df7409f9a0672dfed
Closes-bug: #1602360
05a0944670