The old NMExportedConnection was used for both client and server-side classes,
which was a mistake and made the code very complicated to follow. Additionally,
all PolicyKit operations were synchronous, and PK operations can block for a
long time (ie for user input) before returning, so they need to be async. But
NMExportedConnection and NMSysconfigConnection didn't allow for async PK ops
at all.
Use this opportunity to clean up the mess and create GInterfaces that both
server and client objects implement, so that the connection editor and applet
can operate on generic objects like they did before (using the interfaces) but
can perform specific operations (like async PK verification of callers) depending
on whether they are local or remote or whatever.
Fix a few problems... No plugin should return secrets in the GetSettings method,
which some plugins did. When that was committed in the commit "system-settings:
don't return secrets in the settings", it broke those plugins that didn't implement
GetSecrets. Each plugin can actually use the same code for GetSettings and
GetSecrets, so implement those generically in the NMExportedConnection class and
remove plugin-specific implementations that all did the same thing.
0.7 requires dbus 1.1 or greater (for system bus activation), so make that
explicit, and remove compat code for D-Bus 0.6 and earlier. Consolidate
the various glib pkgconfig checks into one, since most anything will require
gthread, glib, and gobject anyway. Fixup the docs makefile to be more
automake-compatible and let 'make clean' actually work correctly when
docs are built.
Clean up handling of "special" keys in keyfiles, ie ones that
need more processing than the basic GKeyFile API supports. Add
MAC address reading (writing support to come).
Additionally, add some test bits for the keyfile plugin that get
run on 'make check'.
