Closes gh-22318

Closes gh-22261

Closes gh-22331

Issue: SPR-17607

Issue: SPR-17605

(cherry picked from commit b2756f5b)

Issue: SPR-17619

(cherry picked from commit 31a24720)

The xml parser does not fill in defaults provided in the XSD when
validation is disabled. As a result, attributes like default-lazy-init
will not receive the value "default" but an empty string.

With this commit, BeanDefinitionParserDelegate now takes this into
account, checking default values against empty string as well as
"default".

As a consequence, default-lazy-init attribute should now work correctly
even when the XSD validation is disabled.

Issue: SPR-8335

Issue: SPR-17581

Issue: SPR-17563

(cherry picked from commit 50e5bdb8)

Issue: SPR-17559

(cherry picked from commit c024bdcc)

Issue: SPR-17385

Issue: SPR-17556

Issue: SPR-17559

(cherry picked from commit 7854b7ac)

Issue: SPR-17540

(cherry picked from commit 16e9b83d)

Issue: SPR-17536

ResolvableType-based matching consistently respects generic factory method return type (even for pre-initialized raw singleton instance)

Issue: SPR-17524

(cherry picked from commit ebbe14c3)

Also includes Apache HttpClient 4.5.6 and HttpAsyncClient 4.1.4.

Issue: SPR-17439

Issue: SPR-17492

Issue: SPR-17508

(cherry picked from commit f5aeb814)

Issue: SPR-17518

Issue: SPR-16405
Issue: SPR-15600

Issue: SPR-17476

(cherry picked from commit 362c59c3)

Issue: SPR-17445

(cherry picked from commit ea3250c8)

Issue: SPR-17374

(cherry picked from commit dc1e3b46)

Issue: SPR-17414

Issue: SPR-17413

(cherry picked from commit dd2ce206)