Revert "Resolve openSUSE devstack failures"

This reverts commit d325875508e7d35d6dd62302d852e83815be2278.
the issue mentioned in the comment is now resolved.

Change-Id: I2705daead3d3b95f6ad82261212f2a1f40a77fb5
diff --git a/tools/install_prereqs.sh b/tools/install_prereqs.sh
index 6189085..da59093 100755
--- a/tools/install_prereqs.sh
+++ b/tools/install_prereqs.sh
@@ -88,15 +88,6 @@
     export PYTHON=$(which python 2>/dev/null)
 fi
 
-if is_suse; then
-    # now reinstall cryptography from source, in order to rebuilt it against the
-    # system libssl rather than the bundled openSSL 1.1, which segfaults when combined
-    # with a system provided openSSL 1.0
-    # see https://github.com/pyca/cryptography/issues/3804 and followup issues
-    sudo pip install cryptography --no-binary :all:
-fi
-
-
 # Mark end of run
 # ---------------