Fix 889fc47 for SSL bumping with an authentication type other than the Basic (#104)

Fix 889fc47 for SSL bumping with an authentication type other than the Basic (#104)

Commit 889fc47 was made to fix issue with Basic authentication and SSL bumping. But after this commit we can no longer properly use http_access with proxy_auth/proxy_auth_regex ACL because that type of ACL always return 1(match) regardless of the conditions in the rules.

Use the caches authentication results (if any) instead of a fixed 1(match) result.