basic,shared: move a bunch of files to src/shared/

The goal is to move everything that requires selinux or smack
away from src/basic/. This means that src/basic/label.[ch] must move,
which implies btrfs-util.[ch], copy.[ch], and a bunch of other files
which form a cluster of internal use.

This is just moving text around, so there should be no functional difference.

test-blockdev-util is new, because path_is_encrypted() is moved to
blockdev-util.c, and so far we didn't have any tests for code there.

src/shared/condition.c

@@ -17,6 +17,7 @@
 #include "apparmor-util.h"
 #include "architecture.h"
 #include "audit-util.h"
+#include "blockdev-util.h"
 #include "cap-list.h"
 #include "cgroup-util.h"
 #include "condition.h"