add /usr/local/lib to library cache

liberasurecode is installed under /usr/local/lib. When building
from source, we need to add that directory to the shared library
cache.

Change-Id: I2541e54b9bd50ea0a4d40e8298d6a9e1f1150449

jenkins/jobs/liberasurecode.yaml

@@ -35,6 +35,8 @@
           ./configure
           make
           sudo make install
+          sudo bash -c "echo /usr/local/lib >> /etc/ld.so.conf"
+          sudo ldconfig
           # test pyeclib
           cd $WORKSPACE/openstack/pyeclib
           tox -e py27