This release should be now stable enough for release

/reviewed-on nexedi/slapos!391

It is combination of requestoptional and serialised.

In order to avoid needless inheritance create JSONCodec and use it, also
with renaming Serialised to RequestJSONEncoded.

Also provide a test asserting that important log is seen in case if no expected
return is set.

Add testfixtures module to catch logging.

if saucelabs_dict is present, then generate delegate runTestSuite to launch test with saucelab
else default one is created

  it  clean up....

  Up to some extent we would like to set diskcache=none and diskaio=native

This reverts commit 2c79bee1 because it depends on rdiff-backup version 1.3.4nxd4 which is not stable yet.

This reverts commit 9b3dfa01

On runner importer script, when updating database, set timeout to 5 seconds (same value as the default in python sqlite3 module: https://docs.python.org/2.7/library/sqlite3.html#sqlite3.connect). If database is locked by another process we wait a bit instead of raise immediately "database is locked". Importer script will raise if database is locked for more than 5 seconds.

/reviewed-on nexedi/slapos!384

they are already pinned in stack/slapos.cfg

When slapos.libnetworkcache is not installed, then shacache is not
enabled, so SR will no longer build when there's a dead link.

/reviewed on nexedi/slapos!379

See https://www.erp5.com/group_section/forum/No-test-results-rtSJ3H4fpC

/reviewed-on nexedi/slapos!382

https://github.com/v8/v8/wiki/Building%20with%20Gyp

aspell-en-dictionary, groonga-normalizer-mysql, file-msooxml, apache-antiloris are not shareable, they write files in other parts.

With new rdiff-backup version, it is possible to speed up push process by ignoring UID/GID changes (as it will always be different because of different partitions)

/reviewed-on nexedi/slapos!378

stack/slapos.cfg: Add slapos.extension.shared. This extension creates .shared file in software directory as a mark of software that was built with shared feature.

This usage of textwrap.dedent *sometimes* does not work and sometimes
create files with indentation, so we don't have "#!/bin/sh" as first
line but "    #!/bin/sh"

Use a "safer" version that should work in all cases.