Enhance redundancy and reliability of net model

[jfriesse]

Copy of RHBZ https://bugzilla.redhat.com/show_bug.cgi?id=1479950.

Idea is to implement:

• Clustered qnetd (active/passive)
• redundant interconnects
• Also implement "unified" algorithm which accepts number of votes "1" - "(n - 1)"

[jfriesse]

Clustered qnetd (RA agent) is now implemented and merged - ClusterLabs/resource-agents#1748