foreman 1.5 - only allows 255 characters for ldap filter

Issue

• When adding a LDAP filter to foreman to allow AD user integration, if the filter is longer than 255 characters, foreman will not allow it to be added.

        cmd="curl -s -H \"Accept:application/json\" -k -u $HAMMER_USER:$HAMMER_PASSWORD \
          -d \"auth_source_ldap[name]=$AD_NAME\" \
          -d \"auth_source_ldap[host]=$AD_SERVER\" \
          -d \"auth_source_ldap[port]=$AD_PORT\" \
          -d \"auth_source_ldap[account]=$AD_ACCT_USER\" \
          -d \"auth_source_ldap[account_password]=$AD_ACCT_PASS\" \
          -d \"auth_source_ldap[base_dn]=$AD_BASE_DN\" \
          -d \"auth_source_ldap[ldap_filter]=$AD_LDAP_FILTER\" \
          -d \"auth_source_ldap[attr_login]=$AD_ATTR_LOGIN\" \
          -d \"auth_source_ldap[attr_firstname]=$AD_ATTR_FIRST\" \
          -d \"auth_source_ldap[attr_lastname]=$AD_ATTR_LAST\" \
          -d \"auth_source_ldap[attr_mail]=$AD_ATTR_EMAIL\" \
          -d \"auth_source_ldap[onthefly_register]=$AD_AUTO_CREATE\" \
          -d \"auth_source_ldap[tls]=$AD_TLS\" \
          $FOREMAN_URL/api/v2/auth_source_ldaps"

• This is with foreman 1.5 version