Since go1.18 is no longer supported, we should switch to a newer
version (("Each major Go release is supported until there are two
newer major releases" [1]).

[1] https://go.dev/doc/devel/release

/reviewed-by @kirr
/reviewed-on nexedi/slapos!1417

We should upgrade to Go 1.20, because Go 1.18 is already no longer supported.
("Each major Go release is supported until there are two newer major releases" [1]).
Go 1.20 is the incremental improvement for earlier go 1.19 release.
We skip Go 1.19, because it's also unsupported as soon as Go 1.21 is
released (this is expected to happen in one month [2]).

Please find all details in the official release note:

    https://go.dev/doc/go1.20

It was released on 2023-02-01 [1]. Due to the go promise of compatibility
most software should still compile without any problems.

We need to differentiate between go before 1.19 and go after 1.19, because
go before 1.19 needs TestSCMCredentials patch, while starting from go
1.19 this patch has been applied upstream [3].

[1] https://go.dev/doc/devel/release
[2] https://tip.golang.org/doc/go1.21
[3] https://github.com/golang/go/commit/f839aaa22b66bc556fac72f7396082212d2ef45d

/reviewed-by @kirr
/reviewed-on nexedi/slapos!1417

See merge request nexedi/slapos!1415

Forward enb.xlog to another fluentd or fluentbit server using fluentd's
forward protocol.

Currently, TLS is enabled and a pre-shared secret key is used for
authentication, but certificate verification is disabled.

Since the wendelin.core 2.alpha3 release 9 month ago, new fixes
were added to wendelin.core, which we would like to have in SlapOS.
One very important new feature is that this wendelin.core version now
support golang 1.20, so with this we can easily proceed to upgrade our
default golang version.

/reviewed-by @kirr
/reviewed-on nexedi/slapos!1416

without this cleanup, the software integration tests of KVM were stuck
forever because unittest was waiting for the subprocess to stop.

if '-ltinfo', '-ltermcap' or '-lcurses' is set in the linker option,
sqlite3 binary wil link to system libtinfo like this:

slapsoft@tomo-node:~/shared/sqlite3/39068f3749274fa37ab3897081678816/.build/sqlite-autoconf-3370200$ ldd sqlite3
	linux-vdso.so.1 (0x00007fff6dfe6000)
	libreadline.so.8 => /opt/slapgrid/shared/readline/13387ca15e2015da77fab391a268aaa6/lib/libreadline.so.8 (0x00007f4418d7d000)
	libtinfo.so.6 => /lib/x86_64-linux-gnu/libtinfo.so.6 (0x00007f4418d40000)
	libz.so.1 => /opt/slapgrid/shared/zlib/ac3692dceab375c8e6b9c06735e5faf2/lib/libz.so.1 (0x00007f4418d1b000)
	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f4418bd7000)
	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f4418bd1000)
	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f4418bad000)
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f44189d9000)
	libncurses.so.6 => /opt/slapgrid/shared/ncurses/13a31fd4ae4eaba4a72e42f42c997f1c/lib/libncurses.so.6 (0x00007f441897c000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f4418f5a000)

if libuuid was present on the system, python would link with it in:
lib/python3.9/lib-dynload/_uuid.cpython-39-x86_64-linux-gnu.so

if libtinfo was present on the system, readline would prefer to use it instead of libncurses

This will let a non-shared Theia (for example coming from shacache
binary) to be able to use the shared parts of a machine.

See merge request !1409

This reverts commit 31eaaec1a2bd8bc8648a686a83be989a9615a93e.

This slows down business template by a factor of two and it seems we
don't need it. I'm experimenting with hacks in ppml.py but maybe just
creating the Unpickler with encoding='utf-8' in
product/ERP5Type/XMLExportImport/__init__.py:267 is enough ?