Be sure to check the exit code of certbot

If we use set -e but no -o pipefail with a pipe, the last command exit code is
used by set -e.

certbot | grep -v something

If the grep exit with a non-zero exit code, set -e stop the execution of the
script.  We don't care about that grep, so we now use the PIPESTATUS.

evoacme/files/evoacme.sh

@@ -204,6 +204,8 @@ main() {
     sudo -u acme test -w "${NEW_DIR}" || error "Directory ${NEW_DIR} is not writable by user 'acme'"
 
     # create a certificate with certbot
+    # we disable the set -e during the certbot call
+    set +e
     sudo -u acme \
         "${CERTBOT_BIN}" \
         certonly \
@@ -220,6 +222,11 @@ main() {
         2>&1 \
             | grep -v "certbot.crypto_util"
 
+    if [ "${PIPESTATUS[0]}" != "0" ]; then
+        error "Certbot has exited with a non-zero exit code"
+    fi
+    set -e
+
     if [ "${DRY_RUN}" = "1" ]; then
         debug "In dry-run mode, we stop here. Bye"
         exit 0