In systemd-233 the format of the constants file changed to use
SD_ID128_MAKE_STR macro and long lines are broken with '\'.
Doing this in sed is too anyoing — add a simple python script to
do the processing.
This way we can skip ENOENT (which happens in containers).
While at it, let's extend the tests a bit, so that we at least
call all functions and check the type of the return value.
Also, drop '.nspawn' from the machine name, nspawn doesn't
use that suffix any more.
Let's pass any flags through to the journal functions without checking
validity. Those functions do their own checking, so there's no need to
second-guess.
The semantics for _Reader(flags=0) are a bit changed:
before, this would be transformed into sd_journal_open(SD_J_LOCAL_ONLY).
Now, this results in sd_journal_open(0). Previous behaviour should be
achieved by not specifying the flags at all.
This change is necessary, because previously it was not possible to
pass flags=0 to sd_journal_open(0), i.e. it was not possible to "merge"
journals through the Python interface.
Similarly, Reader(flags=0) now means to open all journals, and
Reader(flags=None) is the same as Reader(flags=LOCAL_ONLY).
