m/node/allocs: split new package off m/node

The metropolis/node package contains various unrelated things. One of
these things are node-wide allocations of identifiers.
These are moved here to the new metropolis/node/allocs package.
Additionally, the constants are renamed to move the type of identifier
in front.

Change-Id: Ibc841ca64d4450a7054463e6d2d44753a118e07a
Reviewed-on: https://review.monogon.dev/c/monogon/+/4566
Reviewed-by: Tim Windelschmidt <tim@monogon.tech>
Tested-by: Jenkins CI
diff --git a/metropolis/test/launch/cli/launch-cluster/BUILD.bazel b/metropolis/test/launch/cli/launch-cluster/BUILD.bazel
index 339ea4c..0e9795b 100644
--- a/metropolis/test/launch/cli/launch-cluster/BUILD.bazel
+++ b/metropolis/test/launch/cli/launch-cluster/BUILD.bazel
@@ -14,7 +14,7 @@
     deps = [
         "//metropolis/cli/flagdefs",
         "//metropolis/cli/metroctl/core",
-        "//metropolis/node",
+        "//metropolis/node/allocs",
         "//metropolis/proto/common",
         "//metropolis/test/launch",
         "@io_bazel_rules_go//go/runfiles",