Run Unbind/Bind VF in a serial manner.

[adrianchiris]

Unbind/Bind VF as well as moving RDMA device to namespace causes rdma resources to be re-created. CNI may be invoked in parallel and kernel may provide a VF RDMA resources under a different name.

As the mapping of RDMA resources is done in Device plugin prior to CNI invocation, it must not change during CNI invocation.

We serialize the CNI's Add,Del operations by Creating/Locking/Unlocking a file, causing kernel to allocate RDMA resources the same name for a given VF.

In the future, Systems should use udev PCI based RDMA device names, ensuring consistent RDMA resources names.

[adrianchiris]

Missing testing on a real system

[coveralls]

Pull Request Test Coverage Report for Build 72

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 42.715%

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Totals
Change from base Build 95:	0.0%
Covered Lines:	214
Relevant Lines:	501

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💛 - Coveralls

[moshe010]

please fix lint errors

[adrianchiris]

forgot to push :\ it should pass now