General HTTP authentication cleanup and fixes

tests/data/test167

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+# Server-side
+<reply>
+<data>
+HTTP/1.1 401 Authorization Required swsclose
+WWW-Authenticate: Digest realm="weirdorealm", nonce="12345"
+
+</data>
+
+<data1000>
+HTTP/1.1 200 OK swsclose
+Server: no
+
+Nice auth sir!
+</data1000>
+
+<datacheck>
+HTTP/1.1 401 Authorization Required swsclose
+WWW-Authenticate: Digest realm="weirdorealm", nonce="12345"
+
+HTTP/1.1 200 OK swsclose
+Server: no
+
+Nice auth sir!
+</datacheck>
+</reply>
+
+# Client-side
+<client>
+<server>
+http
+</server>
+ <name>
+HTTP with proxy-requiring-Basic to site-requiring-Digest
+ </name>
+ <command>
+http://data.from.server.requiring.digest.hohoho.com/167 --proxy http://%HOSTIP:%HOSTPORT --proxy-user foo:bar --digest --user digest:alot
+</command>
+</test>
+
+# Verify data after the test has been "shot"
+<verify>
+<strip>
+^User-Agent: curl/.*
+</strip>
+<protocol>
+GET http://data.from.server.requiring.digest.hohoho.com/167 HTTP/1.1
+Proxy-Authorization: Basic Zm9vOmJhcg==
+User-Agent: curl/7.12.0-CVS (i686-pc-linux-gnu) libcurl/7.12.0-CVS OpenSSL/0.9.6b zlib/1.1.4 c-ares/1.2.0 libidn/0.4.3
+Host: data.from.server.requiring.digest.hohoho.com
+Pragma: no-cache
+Accept: */*
+
+GET http://data.from.server.requiring.digest.hohoho.com/167 HTTP/1.1
+Proxy-Authorization: Basic Zm9vOmJhcg==
+Authorization: Digest username="digest", realm="weirdorealm", nonce="12345", uri="/167", response="13c7c02a252cbe1c46d8669898a3be26"
+User-Agent: curl/7.12.0-CVS (i686-pc-linux-gnu) libcurl/7.12.0-CVS OpenSSL/0.9.6b zlib/1.1.4 c-ares/1.2.0 libidn/0.4.3
+Host: data.from.server.requiring.digest.hohoho.com
+Pragma: no-cache
+Accept: */*
+
+</protocol>
+</verify>