iptools: set test size

iptools/BUILD.bazel

@@ -11,6 +11,7 @@ go_library(
     ],
     importpath = "git.wntrmute.dev/kyle/kdhcp/iptools",
     visibility = ["//visibility:public"],
+    deps = ["@dev_wntrmute_git_kyle_goutils//assert"],
 )
 
 go_test(
@@ -21,4 +22,5 @@ go_test(
         "range_test.go",
     ],
     embed = [":iptools"],
+    size = "small",
 )