Fix \-unescaping in quoted strings from helpers

strwordtok() was unescaping '\' values in unquoted tokens. This causes
problems with NTLM helper response user\DOMAIN values which are sent as
a un-quoted un-escaped value.

Restrict un-escaping of '\' to only occur when inside "quoted" words.
Bug 3985: 60s limit introduced by balance_on_multiple_ip breaks bad IP recovery

Alternative fix if necessary would be to calculate a dynamic timeout
value based on number and timeouts for connections and forwarding.

However, as noted in the bug report the address markings are reset every
TTL when the stored RR are replaced. This meets the criteria for periodic
retries of marked-BAD IPs. Also if all IPs are marked BAD they all get
un-marked and retried. So for now just remove the TTL hack.