FWTS: Add PATH for RHEL
FWTS: Add PATH for RHEL

On RHEL ppc64le there is not an RPM package so the FWTS code is
cloned and installed locally, so add PATH to allow proper
search for binary.

Signed-off-by: Deb McLemore <1938e6bc52a6fb400ff401d42bc5360c2c7aaa30@linux.ibm.com>

open-power/op-test-framework,open-power/op-test-framework,open-power/op-test-framework