Only shacache assures stable URLs for reproducible builds.

This is a fixup of 5e69756c

fixup of nexedi/slapos.package@f04d923d

This reverts commit 6e5b4d76 and commit 055ffef4.

After nexedi/slapos.buildout@0abf873d we don't have compiled wheels anymore

With previous version of setuptools (33.1.1), we have errors when downloading the latest version:

While:
  Bootstrapping.
  Getting distribution for 'setuptools==44.1.1'.
Error: https://files.pythonhosted.org/packages/b2/40/4e00501c204b457f10fe410da0c97537214b2265247bc9a5bc6edd55b9e4/setuptools-44.1.1.zip#sha256=c67aa55db532a0dadc4d2e20ba9961cbd3ccc84d544e9029699822542b5a476b hostname 'files.pythonhosted.org' doesn't match 'r.ssl.fastly.net'

See merge request nexedi/slapos.package!146

Having base playbook for Rapid.Space VPS servers is a good way to automate
common tasks on such servers.

Additional role rapid-space-vps-base is added for furhter extensions.

Unfortunately a lot of various approaches is needed:

 * ini_file for oneline manipulation
 * blockinfile for adding a section
 * lineinfile for uncommenting

Note: it was discovered, that some specific parts are just missing in
vifib-server, so add them there.

See merge request nexedi/slapos.package!143

See merge request nexedi/slapos.package!144

patsubst adds whitespaces preventing the correct file, perl
and chrpath to be used. For archlinux package file command fails
because of this.

33.1.0 fails to find zc.buildout

This replaces a long pipeline that only failed if the last pipe
command fails. But on Arch, we got the following error:

  xargs: file: terminated by signal 31

and the build continued, pretending it was successful whereas the
package was unusable.

This is similar to bash's pipefail.

Note that 'chrpath -k' exit code is ignored
because it is expected to return 2.

Fedora distribution refuses shebang with unknown python version:
ERROR: ambiguous python shebang in /opt/slapos/tmp-networkcached/bin/networkcache-download: #!/usr/bin/python. Change it to python3 (or python2) explicitly.
ERROR: ambiguous python shebang in /opt/slapos/tmp-networkcached/bin/networkcache-upload: #!/usr/bin/python. Change it to python3 (or python2) explicitly.
ERROR: ambiguous python shebang in /opt/slapos/tmp-networkcached/bin/buildout: #!/usr/bin/python. Change it to python3 (or python2) explicitly.
ERROR: ambiguous python shebang in /opt/slapos/tmp-networkcached/bin/generate-signature-key: #!/usr/bin/python. Change it to python3 (or python2) explicitly.

Using python2.7 explicitely will make the shebang /usr/bin/python2.7

This is needed specially for kernel after 4.16 (especially 4.19, kernel
version of Debian 10) because much more objects are counted in this
max_size limit.

See interesting discussion here: https://lore.kernel.org/patchwork/patch/1245043/

Also stop using deprecated TarFile.add's exclude parameter.

Shipping binaries in /usr/sbin fails because /usr/sbin is a symlink
to /usr/bin. Similarly, /lib is a symlink to /usr/lib.

https://wiki.archlinux.org/index.php/Frequently_asked_questions#Does_Arch_follow_the_Linux_Foundation's_Filesystem_Hierarchy_Standard_(FHS)?

Unfortunately, pip download is no good at downloading only. It always want to instal the egg which is not feasible (see this issue https://github.com/pypa/pip/issues/1884).

Fixup for 6e5b4d76

also remove slapos-test-node playbook as we don't need it anymore

See merge request !136

See merge request !135