MINOR: http-rules: Set SF_ERR_PRXCOND termination flag when a header rewrite fails

When a header rewrite fails, an internal errors is triggered. But
SF_ERR_INTERNAL is documented to be the concequence of a bug and must be
reported to the dev teamm. So, when this happens, the SF_ERR_PRXCOND termination
flag is set now.
1 file changed