nspawn: UP the host side of the veth pair after adding it to a bridge
Use strlen even for constant strings

GCC optimizes strlen("string constant") to a constant, even with -O0.
Thus, replace patterns like sizeof("string constant")-1 with
strlen("string constant") where possible, for clarity.  In particular,
for expressions intended to add up the lengths of components going into
a string, this often makes it clearer that the expression counts the
trailing '\0' exactly once, by putting the +1 for the '\0' at the end of
the expression, rather than hidden in a sizeof in the middle of the
expression.
timedated: handle external system time changes
timedated: update spike handling
timedated: update spike handling
timedated: move test logging to test program
systemctl: introduce -r switch to show units running in local containers in addition to the host
journald: remove stray reset of error return value
journal: extract duplicated code to a function
journal: extract duplicated code to a function
journal: export valid_user_field and size defines

In preparation for use elsewhere.
shared: export is_dir
activate: export make_socket_fd

Also improve logging to print out the parsed address on error.
journal-gatewayd: ask clients to provide certificates

A certificate authority certificate will be presented to clients,
causing them to present their client certificate, if it is signed by
this authority (default behaviour of most clients). No certificate
checking is actually performed.
build-sys: add check on gnutls
journal-gatewayd: log to journal from gnutls

Prefix "gnutls: " is added. Some semi-random mapping of gnutls levels
to syslog levels is done, but since gnutls levels seem to be used
rather loosely, most end up as debug.
journal-gatewayd: check if certificate is signed by CA

If --trust=ca.crt is used, only clients presenting certificates signed
by the ca will be allowed to proceed. No hostname matching is
performed, so any client wielding a signed certificate will be
authorized.

Error functions are moved from journal-gateway to microhttp-util and
made non-static, since now they are used in two source files.
journal-remote: tool to receive messages over the network
journal-remote: HTTP(s) support

The whole tool is made dependent on µhttpd availability. It should be
easy to make the µhttpd parts conditional, but since transfer over
HTTP seems to be the primary use case, currently this is not done.

Current implementation uses nested epoll loops: sd-event is used for
the external event loop, and µhttpd uses epoll in its own
loop. Unfortunately µhttpd does not expose enough information to add
the descriptors it uses to the external event loop. This means that
starvation of other events is possible, if one of the inner µhttpd
loops is constantly busy. This means that µhttpd servers should not
be mixed with other sources.

The TLS authentication parts haven't been really tested properly, and
should not be take too seriously.
microhttpd-util: use static buffer for static messages

Most of the messages we send do not require a allocating and
freeing a buffer, to optimize this by using const strings.

Also, rename respond_error to mhd_respond*, since it is used
not only for errors.

Make use of information from printf to avoid one extra call to
strlen.