Move bootctl to its own source subdirectory

It's been split into a bunch of files and deserves its own subdirectory
similarly to systemctl.

src/bootctl/bootctl-uki.c

@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <fcntl.h>
+
+#include "alloc-util.h"
+#include "bootctl-uki.h"
+#include "kernel-image.h"
+
+int verb_kernel_identify(int argc, char *argv[], void *userdata) {
+        KernelImageType t;
+        int r;
+
+        r = inspect_kernel(AT_FDCWD, argv[1], &t, NULL, NULL, NULL);
+        if (r < 0)
+                return r;
+
+        puts(kernel_image_type_to_string(t));
+        return 0;
+}
+
+int verb_kernel_inspect(int argc, char *argv[], void *userdata) {
+        _cleanup_free_ char *cmdline = NULL, *uname = NULL, *pname = NULL;
+        KernelImageType t;
+        int r;
+
+        r = inspect_kernel(AT_FDCWD, argv[1], &t, &cmdline, &uname, &pname);
+        if (r < 0)
+                return r;
+
+        printf("Kernel Type: %s\n", kernel_image_type_to_string(t));
+        if (cmdline)
+                printf("    Cmdline: %s\n", cmdline);
+        if (uname)
+                printf("    Version: %s\n", uname);
+        if (pname)
+                printf("         OS: %s\n", pname);
+
+        return 0;
+}