Remove extra websockify dependency cleanup step

This started to fail due to a missing || : / --force option now
that the dependencies got fixed:

2017-07-30 19:38:37.260 | ++ tools/install_prereqs.sh:source:97       :   sudo rpm -e --nodeps python-cffi python-cryptography python-pyOpenSSL
2017-07-30 19:38:37.293 | error: package python-cffi is not installed
2017-07-30 19:38:37.293 | error: package python-cryptography is not installed
2017-07-30 19:38:37.293 | error: package python-pyOpenSSL is not installed

Change-Id: Ia59afb7ee564cf2044ebdb3c5ad3e54ee91d1222
diff --git a/tools/install_prereqs.sh b/tools/install_prereqs.sh
index 9334910..6189085 100755
--- a/tools/install_prereqs.sh
+++ b/tools/install_prereqs.sh
@@ -89,17 +89,10 @@
 fi
 
 if is_suse; then
-    # novnc has an extraneous dependency on pyOpenSSL, which causes symbol conflicts
-    # in the bundled libssl of python-cryptography. when both are loaded into the same
-    # process, they start hanging or segfaulting.
-    install_package novnc
-    # deinstall the extra but irrelevant dependencies
-    sudo rpm -e --nodeps python-cffi python-cryptography python-pyOpenSSL
-    # reinstall cffi which got overwriten by the package.
-    sudo pip install -I cffi
     # 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 the system provided (which libpython links against) openSSL 1.0
+    # 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