Disable gtod_reduce for benchmarks

This ended up disabling latency measurements entirely, so don't use this
option for benchmarks.

api-daemon/pvcapid/benchmark.py

@@ -236,7 +236,6 @@ def run_benchmark(self, pool):
                 --rbdname={volume} \
                 --direct=1 \
                 --randrepeat=1 \
-                --gtod_reduce=1 \
                 --iodepth=64 \
                 --size=8G \
                 --name={test} \

client-cli/cli_lib/ceph.py

@@ -1527,7 +1527,7 @@ def format_info_benchmark(config, benchmark_information):
             bandwidth_length=bandwidth_column_length,
             iops="IOPS",
             iops_length=iops_column_length,
-            latency="Latency",
+            latency="Latency (μs)",
             latency_length=latency_column_length,
             cpuutil_label='',
             cpuutil_label_length=cpuutil_label_length,