[BUILD] Add sigar binaries when running unittests
[BUILD] Add sigar binaries when running unittests

the sigar binaries are not available when running tests today. This commit adds the path to the test run

Related to:

* https://github.com/elastic/elasticsearch/commit/bdc4c7f84ca7bbb9931b54331ae601b1cebbb733

rmuir/elasticsearch-parent,elastic/elasticsearch-parent,dadoonet/elasticsearch-parent