lib/plugins: do not build a static library

While there certainly were some reasons to have this library built
statically, we have lost memory of those. It seems that building this as
a shared library works, and plugins can be successfully linked against
it (tested with the OAuth plugin).
Build: add CMake config files for Qt5
lib: don't emit a critical warning on p2p socket failure

This message appears all the time, when the daemon is not running.
The "DEBUG" level seems more appropriate.
signond: fix passing of DBus maps to plugins

Fix a couple of errors: misusing the pointer to a boolean as the boolean
itself, and assuming that all D-Bus maps passed to plugins are "a{sv}".
Merge from upstream
Merge branch 'no-static-plugin-lib'
signond: notify clients of credentials updates

When the username gets updated from an authentication plugin (typically
after an interaction with signon-ui), we must notify the client that the
identity data has changed.
Tests: make database test more robust

The order of mechanisms in the QStringList is not guaranteed to stay the
same. Therefore, the method maps need to be compared more carefully.
Merge from upstream
Sync from archive

In debian/rules move qt4 cmake files to not clash with qt5 cmake files
Sync from the archive

* Changes to enable reverse-deps to be cross-built, since cross-pkg-config
  no longer looks in /usr/lib/pkgconfig for pcfiles. (LP: #1316667)
* Install into Multi-Arch directories and set M-A: Same on library packages.
signond: fix build of remotepluginprocess
Merge from upstream
Version 8.57
* New upstream release

  - Build: add CMake config files for Qt5
  - Tests: make database test more robust
  - signond: notify clients of credentials updates
  - signond: fix passing of DBus maps to plugins
  - lib: don't emit a critical warning on p2p socket failure
  - lib/plugins: do not build a static library
Packaging fixes
Upstream changes

- signond: fix passing of DBus maps to plugins
- lib: don't emit a critical warning on p2p socket failure
- Build: add CMake config files for Qt5 Fixes: 1156776, 1237782, 1258578, 1267805, 1343556
Approved by: PS Jenkins bot, David Barth
Releasing 8.57+14.10.20140827-0ubuntu1
Fix libsignonplugins-dev dependencies
Fix signon-plugins-dev dependencies

Since this turned into a shared library, it must depend on the binary package. Fixes: 1156776, 1237782, 1258578, 1267805, 1343556
Approved by: PS Jenkins bot, David Barth