Add development libraries needed by Pillow

Change I8da7dd95ae24cf06dc7bdc300fcf39947a6df093 added Pillow build deps
to nodepool thick slaves.  This means that Pillow 3 will work in unit
tests.

Make the matching change to allow Pillow 3.0.0 to work under devstack.

The longer term aim is to remove temporary upper cap.

Change-Id: I2bec8cf1bfeaaa6ae329704229fdeb86d26e55c7
diff --git a/files/rpms-suse/general b/files/rpms-suse/general
index 651243d..34a2955 100644
--- a/files/rpms-suse/general
+++ b/files/rpms-suse/general
@@ -9,6 +9,7 @@
 graphviz # docs
 iputils
 libffi-devel  # pyOpenSSL
+libjpeg8-devel # Pillow 3.0.0
 libmysqlclient-devel # MySQL-python
 libopenssl-devel # to rebuild pyOpenSSL if needed
 libxslt-devel  # lxml
@@ -26,3 +27,4 @@
 tcpdump
 unzip
 wget
+zlib-devel