Merge pull request dinkel#18

ignore set -e at grep SLAPD_

Because "set -e option in entrypoint.sh"
if `env | grep SLAPD_` (don't set SLAPD_* env) returned an error, shell
script stops.

Author: fedde-s

entrypoint.sh

@@ -107,7 +107,9 @@ EOF
 
     chown -R openldap:openldap /etc/ldap/slapd.d/
 else
+    set +e
     slapd_configs_in_env=`env | grep 'SLAPD_'`
+    set -e
 
     if [ -n "${slapd_configs_in_env:+x}" ]; then
         echo "Info: Container already configured, therefore ignoring SLAPD_xxx environment variables and preseed files"