CI: Temporarily disable certificate generation on MacOS X Travis

Problems with the default LibreSSL vs OpenSSL

tools/travis/travis_osx_script.sh

@@ -5,14 +5,14 @@ echo "\n=== Building ==="
 export OPENSSL_ROOT_DIR="/usr/local/opt/openssl"
 export PATH="/Users/travis/Library/Python/2.7/bin:$PATH"
 
-echo "Documentation and certificate build" && echo -en 'travis_fold:start:script.build.doc\\r'
-mkdir -p build && cd build
-cmake -DCMAKE_BUILD_TYPE=Release -DUA_BUILD_EXAMPLES=ON -DUA_BUILD_SELFSIGNED_CERTIFICATE=ON ..
-make selfsigned
-ls examples
-cp examples/server_cert.der ../
-cd .. && rm -rf build
-echo -en 'travis_fold:end:script.build.doc\\r'
+# echo "Documentation and certificate build" && echo -en 'travis_fold:start:script.build.doc\\r'
+# mkdir -p build && cd build
+# cmake -DCMAKE_BUILD_TYPE=Release -DUA_BUILD_EXAMPLES=ON -DUA_BUILD_SELFSIGNED_CERTIFICATE=ON ..
+# make selfsigned
+# ls examples
+# cp examples/server_cert.der ../
+# cd .. && rm -rf build
+# echo -en 'travis_fold:end:script.build.doc\\r'
 
 echo "Full Namespace 0 Generation" && echo -en 'travis_fold:start:script.build.ns0\\r'
 mkdir -p build