Set TOOLSDIR only at build-time

This helps to make sure that we are not utilizing things in TOOLSDIR
at run-time.  TOOLSDIR is not part of packaging that is installed on
cluster systems. At run-time we should only use things system installed
or in the trafodion package.

Tested and passed node_test jobs.

Change-Id: I8193bb7eb9a564f7fd840a253800752610370e8f
Blueprint: infra-build-hadoop-deps