Commits on Mar 8, 2022

1. xrootd: improve read performances 10-fold …

   This CL reduces the lock contention on xrootd.File operations.
   
   ```
     $> benchstat ./ref.txt ./new.txt
     name    old time/op    new time/op    delta
     Read-8     67.2s ± 1%      5.4s ± 7%  -91.93%  (p=0.000 n=9+28)
   
     name    old alloc/op   new alloc/op   delta
     Read-8     343MB ± 0%     341MB ± 0%   -0.78%  (p=0.000 n=8+30)
   
     name    old allocs/op  new allocs/op  delta
     Read-8      277k ± 0%      288k ± 0%   +3.84%  (p=0.000 n=7+29)
   ```
   
   and now:
   ```
     $> time root-dump root://ccxrootdgotest.in2p3.fr:9001/tmp/rootio/testdata/SMHiggsToZZTo4L.root > /dev/null
   
     real	0m7.279s
     user	0m8.221s
     sys	0m1.256s
   ```
   
   compared to:
   
   ```
     $> time root-dump https://cern.ch/binet/big-file.root > /dev/null
   
     real	0m5.454s
     user	0m6.156s
     sys	0m0.228s
   ```
   
   Updates go-hep#920.

   

   sbinet committed Mar 8, 2022
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