Cover the case of bootstrapping a site a second time without cleaning
the web/ directory when the user changed the value of SITE_BASE_PATH in
bootstrap.conf: be sure to propagated the change to the .htaccess file.
[ -d ../config/sync ] && sudo chgrp -R "$WEB_SERVER_GROUP" ../config/sync
# Enables clean URLs
-sed -i "s@# RewriteBase /drupal\$@RewriteBase ${SITE_BASE_PATH}@" .htaccess
+sed -i "s@\(# \)\{0,1\}RewriteBase .*\$@RewriteBase ${SITE_BASE_PATH}@" .htaccess
chmod 755 sites/default
chmod 644 sites/default/settings.php