tree-wide: random macro cleanups Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

tree-wide: remove any variable length arrays They are pointless and marked optional since C11. Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

tests: remove overflow tests They do not behave correctly on some architectures, so let's remove them for now and come up with better ones later. Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

tests: add unit tests for lxc_safe_long() Signed-off-by: Christian Brauner <christian.brauner@canonical.com>

tests: add unit tests for lxc_safe_int() Signed-off-by: Christian Brauner <christian.brauner@canonical.com>

tests: add unit tests for lxc_safe_uint() Signed-off-by: Christian Brauner <christian.brauner@canonical.com>

tests: add test for detect_ramfs_rootfs() Signed-off-by: Christian Brauner <christian.brauner@canonical.com>

tests: add unit tests for lxc_deslashify() Signed-off-by: Christian Brauner <christian.brauner@canonical.com>

tests: add unit tests for lxc_string_in_array() Signed-off-by: Christian Brauner <cbrauner@suse.de>

tests: add unit tests for lxc_string_replace() Signed-off-by: Christian Brauner <cbrauner@suse.de>