travis: disable spack spec for python 2.7 as well as 2.6

- keep this disabled until the `compiler find` fork bomb is fixed.

share/spack/qa/run-unit-tests

@@ -31,7 +31,7 @@ ${coverage_run} bin/spack -h
 ${coverage_run} bin/spack help -a
 
 # Profile and print top 20 lines for a simple call to spack spec
-if [[ $TRAVIS_PYTHON_VERSION != 2.6 ]]; then
+if [[ $TRAVIS_PYTHON_VERSION != 2* ]]; then
     ${coverage_run} bin/spack -p --lines 20 spec mpileaks%gcc ^elfutils@0.170
 fi