fix(toolbox): minor fixes

Xen-boot detect memory starvation when requested memory is greater
than (not greater or equal) the avaiable memory.
Throw an error when fail to boot in experiment.
fix(toolbox): remove a useless unlink

Do not remove the pid file on oproperf and let the user handle it.
feat(toolbox): add an experiment on native linux

Add the streamcluster experiment on native (without Xen) linux.
feat(toolbox): add a perf monitoring script based on xenperf

Add a monitoring script based on the xenperf tool.
fix(xenperf): add an autoflush

Make the xenperf tool autoflush its results.
Otherwise, when launched in background and killed, not all the results
are written on disk.
docs(xenperf): change the number version

Change the number version because of the hotfix.
Merge branch 'hotfix-1.0.2'
Merge branch 'master' into benchmark-toolbox