rollandf / sriov-network-device-plugin / 11442710652

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bug: rdma exlusive handling

In case a RDMA device in exclusive mode is in use
by a Pod, the DP was not reporting it as a resource
after DP restart.

Following changes are introduced in RdmaSpec:

- isRdma: in case of no rdma resources,
  check if netlink "enable_rdma" is available.
- GetRdmaDeviceSpec: the device specs are retrieved
  dynamically and not on discovery stage as before.

Dynamic RDMA specs computatiopn vs on discovery, comes
to solve following scenario for exlusive mode:
- Discover RDMA device
- Allocate to Pod (resources are hidden on host)
- Restart DP pod
- Deallocate
- Reallocate

Fixes #565

Signed-off-by: Fred Rolland <frolland@nvidia.com>

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