lmbench: New component to measure many performance characteristics

lmbench is a bit outdated tool to do OS performance analysis. The
upcoming neotest SR will use lat_tcp from this packages to measure TCP
round-trip-time latency.

We use a bit patched version with fixes to lat_tcp for errors not to go
unnoticed and also lat_tcp.go added to see how using Go compares to
plain lat_tcp.c for latencies.

In the upcoming neotest SR both lat_tcp C & Go versions will be used to
automatically benchmark TCP round-trip-times over network link in between
2 machines.

component/lmbench/buildout.cfg

+# LMbench - Tools for Performance Analysis
+# http://www.bitmover.com/lmbench/
+[buildout]
+extends =
+    ../git/buildout.cfg
+    ../golang/buildout.cfg
+
+parts   =
+    lmbench
+
+
+[lmbench-repository]
+<= git-repository
+# NOTE we use a bit patched lmbench version with fixes to lat_tcp for errors not to go unnoticed and other addons
+# repository = https://svn.code.sf.net/p/lmbench/code
+repository = https://lab.nexedi.com/kirr/lmbench.git
+revision = 9b108b6ff3
+
+[lmbench]
+recipe  = slapos.recipe.cmmi
+path    = ${lmbench-repository:location}
+configure-command = :
+make-binary =
+# XXX without vvv BASE=${:location} does not work
+location= ${buildout:parts-directory}/${:_buildout_section_name_}
+make-targets= cd ${lmbench-repository:location}/lmbench3/src
+              && make install BASE=${:location}
+              && bash -c ". ${gowork:env.sh} && go build -o ${:location}/bin/lat_tcp_go lat_tcp.go"