LU-10804 echo: allow echo server to setup procfs

LU-10804 echo: allow echo server to setup procfs

Restore lprocfs init for echo server. It is still using
procfs for stats.

Fixes: 0100ab268c3120aa84847a88a2493988f38dee6b
Test-Parameters: trivial envdefinitions=SLOW=yes testlist=obdfilter-survey osscount=1 ostcount=4 mdscount=1 mdtcount=1
Signed-off-by: Mikhail Pershin <mike.pershin@intel.com>
Change-Id: I7a1bf7de3d7c3202e6da7545da63979555ce6624
Reviewed-on: https://review.whamcloud.com/31664
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Fan Yong <fan.yong@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Elena Gryaznova <c17455@cray.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>