Add the exact matching modifier support "=" to the NCCL_IB_HCA variable (#236)

Perform exact matching when the prefix "=" is specified in the NCCL_IB_HCA variable to exclude HCAs mlx5_X[0-9]+ when mlx5_X is specified.

[ROCm/rccl commit: 0b192d2299]

projects/rccl/src/include/utils.h

@@ -20,6 +20,6 @@ struct netIf {
 };
 
 int parseStringList(const char* string, struct netIf* ifList, int maxList);
-bool matchIfList(const char* string, int port, struct netIf* ifList, int listSize);
+bool matchIfList(const char* string, int port, struct netIf* ifList, int listSize, bool matchExact);
 
 #endif