rename port attribute variable to SECURITYGROUPS from SECURITYGROUP

This patch renames the port attribute variable to the plural form since
multiple security groups can be associated with a port. This patch does
not change the security groups api and also does not change the
configuration section name to be SECURITYGROUPS.
Fixes bug 1095885

Change-Id: I1a4df337b48da0ef9c94d74b04c0b86333ce2f0c
Fix for loadbalancer vips list

Fixes bug 1098165

Change-Id: I86106d39afc9d5d8c6d2d0bbdcd829baf2c1b66b
Merge "rename port attribute variable to SECURITYGROUPS from SECURITYGROUP"
Fixes i18n messages in nvp plugin

Fixes bug 1096205
Change-Id: Icb34b567a8630bb7247b2bb2d6efaf53269bf84b
Merge "Fix for loadbalancer vips list"
Merge "Fixes i18n messages in nvp plugin"