Merge both install packages scripts

To simplify the installation of packages while building a Docker image, we have merged both install-packages.sh and install-local-packages.sh scripts into only one install-packages.sh that will handle both packages from Connect and from local packages while offline. FROM <DOCKER_REGISTRY>/nuxeo:<TAG> ... # Install a local package without its dependencies (`mp-install --nodeps`) RUN /install-packages.sh --offline $NUXEO_HOME/local-packages/local-package-nodeps.zip # Install remote packages and a local package with its dependencies RUN /install-packages.sh --clid ${CLID} --connect-url ${CONNECT_URL} nuxeo-web-ui nuxeo-drive $NUXEO_HOME/local-packages/local-package.zip ...