mpi/pmix: Avoid extra nodeid-nodename resolutions
Improves ping-pong latency test results:
size UCXv2 UCXv3
1 30 25
2 30 25
4 30 25
8 30 26
16 30 26
32 31 26
64 31 27
128 31 27
256 32 28
512 33 28
1024 33 28
2048 34 30
4096 37 32
8192 42 38
16384 45 42
32768 52 47
65536 64 59
131072 88 83
262144 2248 2224
524288 2879 2782
1048576 3770 3624
2097152 6234 6135
4194304 10473 10427
Signed-off-by: Artem Polyakov <artpol84@gmail.com>
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