ci: Remove the need of using TRAVIS in env.

Since now we want to use production suites on Circle CI so there
is no need to set TRAVIS in env while running scripts.

CIRCLECI is set default in the enviroment of Circle CI builds
so we can use it directly.

Also Travis CI had rabbitmq-server installed so we had to add workaround
in install script to avoid the error. That workaround is removed.

scripts/lib/install

@@ -276,7 +276,7 @@ EOF
     #
     # (There are more possibilities in the case of dpkg errors.)  Here
     # we are checking for either empty or not-installed.
-    if [ -n "$TRAVIS" ] || ! dpkg-query --showformat '${Status}\n' -W rabbitmq-server 2>/dev/null | grep -vq ' not-installed$'; then
+    if ! dpkg-query --showformat '${Status}\n' -W rabbitmq-server 2>/dev/null | grep -vq ' not-installed$'; then
         cat <<EOF
 
 [rabbitmq]

tools/ci/production-helper

@@ -17,12 +17,8 @@ if ! apt-get dist-upgrade -y "${APT_OPTIONS[@]}"; then
     apt-get dist-upgrade -y "${APT_OPTIONS[@]}"
 fi
 
-# Disable existing rabbitmq node so we can change it
-service rabbitmq-server stop
-rm -rf /var/lib/rabbitmq/mnesia/
-
 # Install Zulip
-env TRAVIS=1 "$ZULIP_PATH"/scripts/setup/install --self-signed-cert --hostname 127.0.0.1 --email [email protected]
+"$ZULIP_PATH"/scripts/setup/install --self-signed-cert --hostname 127.0.0.1 --email [email protected]
 
 cat >>/etc/zulip/settings.py <<EOF
 # Circle CI override settings above

tools/ci/setup-production

@@ -23,7 +23,7 @@ tools/provision --production-test-suite || {
 cp -a tools/ci/success-http-headers.txt ~/
 source tools/ci/activate-venv
 
-if ! env TRAVIS=1 ./tools/build-release-tarball test; then
+if ! ./tools/build-release-tarball test; then
     echo "Attempting to output failure logging data"
     cat /tmp/tmp.*/update-prod-static.log || true
     exit 1

tools/provision

@@ -38,7 +38,7 @@ if [ "$failed" -ne 0 ]; then
     echo "* Logs are here: zulip/var/log/provision.log"
     echo -e "$ENDC"
     exit "$failed"
-elif [ "$VIRTUAL_ENV" != "/srv/zulip-py3-venv" ] && [ -z "${TRAVIS}${SKIP_VENV_SHELL_WARNING}" ]; then
+elif [ "$VIRTUAL_ENV" != "/srv/zulip-py3-venv" ] && [ -z "${CIRCLECI}${SKIP_VENV_SHELL_WARNING}" ]; then
     echo -e "$WARNING"
     echo "WARNING: This shell does not have the Zulip Python 3 virtualenv activated."
     echo "Zulip commands will fail until you activate the virtualenv."