URL parser: IPv6 zone identifiers are now supported
http2: remove _DRAFT09 from the NPN_HTTP2 enum

We're progressing throught drafts so there's no point in having a fixed
one in a symbol that'll survive.
http2: let openssl mention the exact protocol negotiated

Remove a superfluous "negotiated http2" info line
docs: Removed mention of -g hack when using IPv6 literals

This limitation was removed in commit 0bc4938e
ipv6: strip off zone identifiers in redirects too

Follow up to 9317eced984 makes test 1056 work again.
tests: Added SMTP with credentials test for RFC-821 based server

Added SMTP (RFC-821 only) based test case as a reference for the fix
provided by commit fe260b75e7.
RELEASE-NOTES: Synced with dd07e79023
urldata: spellfix comment

Reported-by: Melissa
tests: Added SMTP with credientials test when not supported by server
smtp: Fixed login denied with a RFC-821 based server

In addition to commit fe260b75e7 fixed the same issue for RFC-821 based
SMTP servers and allow the credientials to be given to curl even though
they are not used with the server.