Change test to compare contents instead of checksum, cleanup (RhBug:2130179)

Update to 0.20.1
createrepo_c shouldn't silently produce duplicate-NEVRA repos
Fix bad performance with task queue management
Update errno usage to fix incorrect GError messages
Install header for createrepo_shared module
Remove C API for cr_xml_parse_main_metadata_together
Remove python bindings for xml_parse_main_metadata_together
Fix '&' encoding in attributes when parsing repodata
Add a streaming parsing API that is user-controllable.
Fix a memory leak of primary pkg when parsing interrupted
Fix a memory leak when removing the first link in a list
Remove `allow_out_of_order` option for `xml_parse_main_metadata_together`
Make parse warnings visible through cr.Repomd(), cr.UpdateInfo()
Use --error-exit-val option by default
If new and old repomd matches during --update don't update
Add `cr_repomd_compare` for comparing two repomds
Store parsed repomd in `cr_MetadataLocation`
Set database version only for the database records, not everything
Use copy+delete fallback when moving of a dir fails
Fix memory leaks
[spec] Option for legacy hashes, enable on RHEL <= 8 (RhBug:2022271)

Revert addition of new API for parsing main metadata together (RhBug:2063141)

Switch default of --keep-all-metadata to TRUE and add --discard-additional-metadata (RhBug:2055032)

Update to 0.17.7
Remove insecure hashes SHA-1 and MD5 from the default build (RhBug:1935486)
Fix error when updating repo with removed modules metadata
Exit with status code 1 when loading of repo's metadata fails
Fix memory leaks (RhBug:1998426)
Fix valgrind warnings caused by subprocess calls

Fix issues detected by static analyzers

Rebuilt for IMA sigs, glibc 2.34, aarch64 flags

Fix spec conditional to enable libmodulemd in RHEL >= 8 (RhBug:1816753)