Normalize coding style by removing consecutive empty lines from C
sources and headers.

https://github.com/NetworkManager/NetworkManager/pull/108

There are multiple tests with the same in different directories; add a
unique prefix to test names so that it is clear from the output which
one is running.

Like autotools, use the wrapper script 'run-nm-test.sh' that starts a
separate D-Bus session when needed.

https://bugzilla.redhat.com/show_bug.cgi?id=1538699

RHEL 7.1 and Ubuntu 14.04 LTS both have this.

https://bugzilla.gnome.org/show_bug.cgi?id=792323

Some targets are missing dependencies on some generated sources in
the meson port. These makes the build to fail due to missing source
files on a highly parallelized build.

These dependencies have been resolved by taking advantage of meson's
internal dependencies which can be used to pass source files,
include directories, libraries and compiler flags.

One of such internal dependencies called `core_dep` was already in
use. However, in order to avoid any confusion with another new
internal dependency called `nm_core_dep`, which is used to include
directories and source files from the `libnm-core` directory, the
`core_dep` dependency has been renamed to `nm_dep`.

These changes have allowed minimizing the build details which are
inherited by using those dependencies. The parallelized build has
also been improved.

Add support for mDNS as a connection-level property. Update ifcfg-rh and
keyfile plugins to support it.

Tests are commonly created via copy&paste. Hence, it's
better to express a certain concept explicitly via a function
or macro. This way, the implementation of the concept can be
adjusted at one place, without requiring to change all the callers.

Also, the macro is shorter, and brevity is better for tests
so it's easier to understand what the test does. Without being
bothered by noise from the redundant information.

Also, the macro knows better which message to expect. For example,
messages inside "src" are prepended by nm-logging.c with a level
and a timestamp. The expect macro is aware of that and tests for it

  #define NMTST_EXPECT_NM_ERROR(msg)      NMTST_EXPECT_NM (G_LOG_LEVEL_MESSAGE, "*<error> [*] "msg)

This again allows the caller to ignore this prefix, but still assert
more strictly.