specs-go/config: Updated rdma resource limits as key-value pair

Updated rdma resource limits as key-value pairs.

This avoid any issues that may arise or complicate code if it is done
using an array, that can contain duplicate entries for a given device.

It also makes resource definition more intutive to describe resource
limit of a device.

Signed-off-by: Parav Pandit <parav@mellanox.com>

specs-go/config.go

@@ -322,8 +322,12 @@ type LinuxNetwork struct {
 
 // LinuxRdma for Linux cgroup 'rdma' resource management (Linux 4.11)
 type LinuxRdma struct {
-	// Hca device name whose resources to be restricted
-	HcaDevice string `json:"hca_device,omitempty"`
+	// Limits are a set of key value pairs that define RDMA resource limits,
+	// where the key is device name and value is resource limits.
+	RdmaLimits map[string]LinuxRdmaLimit `json:"limits,omitempty"`
+}
+
+type LinuxRdmaLimit struct {
 	// Maximum number of HCA handles that can be opened. Default is "no limit".
 	HcaHandles *uint32 `json:"hca_handles,omitempty"`
 	// Maximum number of HCA objects that can be created. Default is "no limit".
@@ -347,7 +351,7 @@ type LinuxResources struct {
 	// Network restriction configuration
 	Network *LinuxNetwork `json:"network,omitempty"`
 	// Rdma resource restriction configuration
-	RdmaLimits []LinuxRdma `json:"rdmaLimits,omitempty"`
+	RdmaLimits LinuxRdma `json:"rdmaLimits,omitempty"`
 }
 
 // LinuxDevice represents the mknod information for a Linux special device file