Log Message:
Changes 3.4.10:
* Fix bootstrap.sh dependency on SPONSORS.list
* HTTP/2: Support 421 (Misdirected Request) status code
* Alternate-Protocol is a hop-by-hop header
* Bug 4148: external_acl_type header format does not accept the new libformat syntax
* Bug 4033: Rebuild corrupted ssl_db/size file
* Bug 3902: Docs: external_acl_type cache hash key
* Bug 4145: squid_endian.h compile errors with OpenBSD 5.6
* Fix segmentation fault in ACLUrlPathStrategy::match