redis related infrastructure update

[osa]

Summary

Redis 6.x is stable now, and it's time to update database/redis port. However, let's keep existing redis 5.x in a separate port, databases/redis5 for the following reasons: backward compatibility at first and for stability as second.
redis 4.x has been marked as deprecated, EOL, will be removed soon.

[mfechner]

I tried to test the new version with gitlab-ce but the patch does not apply cleanly:

╰─ svn patch D24675_new_.diff
U         UPDATING
>         applied hunk @@ -5,6 +5,23 @@ with offset 23 and fuzz 2
U         databases/Makefile
>         applied hunk @@ -866,6 +866,7 @@ with offset 1
U         databases/redis-devel/Makefile
U         databases/redis-devel/distinfo
U         databases/redis/Makefile
U         databases/redis/distinfo
U         databases/redis/files/extra-patch-src-Makefile.lua
U         databases/redis/files/extra-patch-src-Makefile.luajit
U         databases/redis/files/extra-patch-src-Makefile.luajit-or
U         databases/redis/files/patch-deps-hiredis-Makefile
U         databases/redis/files/patch-deps-hiredis-net.c
U         databases/redis/files/patch-redis.conf
U         databases/redis/files/patch-src-Makefile
U         databases/redis/files/patch-src-mkreleasehdr.sh
U         databases/redis4/Makefile
C         databases/redis5/Makefile
>         rejected hunk @@ -1,10 +1,11 @@
>         rejected hunk @@ -71,7 +72,7 @@
Summary of conflicts:

[osa]

Matthias,

I've recreated the patch after the update of the databases/redis-devel to 6.0.1.