Move all crates under crates/

Just organizational cleanup, a number of Rust projects
do this:
https://github.com/search?q=+%22crates%2F*%22+path%3ACargo.toml+-is%3Afork&type=code&p=5

Signed-off-by: Colin Walters <walters@verbum.org>

Author: cgwalters

Cargo.toml

@@ -1,17 +1,5 @@
 [workspace]
-members = [
-    "cli",
-    "system-reinstall-bootc",
-    "lib",
-    "mount",
-    "ostree-ext",
-    "utils",
-    "blockdev",
-    "xtask",
-    "tests-integration",
-    "tmpfiles",
-    "sysusers",
-]
+members = ["crates/*"]
 resolver = "2"
 
 [profile.dev]

Makefile

@@ -13,7 +13,7 @@ install:
 	install -d -m 0755 $(DESTDIR)$(prefix)/lib/bootc/bound-images.d
 	install -d -m 0755 $(DESTDIR)$(prefix)/lib/bootc/kargs.d
 	ln -s /sysroot/ostree/bootc/storage $(DESTDIR)$(prefix)/lib/bootc/storage
-	install -D -m 0755 cli/bootc-generator-stub $(DESTDIR)$(prefix)/lib/systemd/system-generators/bootc-systemd-generator 
+	install -D -m 0755 crates/cli/bootc-generator-stub $(DESTDIR)$(prefix)/lib/systemd/system-generators/bootc-systemd-generator 
 	install -d $(DESTDIR)$(prefix)/lib/bootc/install
 	# Support installing pre-generated man pages shipped in source tarball, to avoid
 	# a dependency on pandoc downstream.  But in local builds these end up in target/man,
@@ -75,7 +75,7 @@ CLIPPY_CONFIG = -A clippy::all -D clippy::correctness -D clippy::suspicious -Dun
 validate-rust:
 	cargo fmt -- --check -l
 	cargo test --no-run
-	(cd ostree-ext && cargo check --no-default-features)
+	(cd crates/ostree-ext && cargo check --no-default-features)
 	(cd lib && cargo check --no-default-features)
 	cargo clippy -- $(CLIPPY_CONFIG)
 	env RUSTDOCFLAGS='-D warnings' cargo doc --lib