use a tag of obs_lsst known to work with w_2019_49 (yes, not just w_2…

…019_39)

travis_test.sh

@@ -8,11 +8,17 @@ pip install pylint
 git clone https://github.com/lsst/obs_lsst.git
 cd obs_lsst
 setup -r . -j
+
+# Checkout a specific tag known to work with imSim and the
+# lsst_distrib version pulled from Dockerhub in .travis.yaml.
+git checkout w.2018.39-run1.2-v3
+
 # Build the obs_lsst package, but avoid the time consuming and lengthy
 # output from the 'tests' target.  The version module is built by the
 # 'tests', so build that explicitly since it is imported by the
 # package itself.
 scons lib python shebang examples doc policy python/lsst/obs/lsst/version.py
+
 cd ..
 eups declare imsim -r ${TRAVIS_BUILD_DIR} -t current
 setup imsim