Milo: Add machine pool info for buildbot builder view.

milo/api/resp/botstatus_string.go

Index: milo/api/resp/botstatus_string.go
diff --git a/milo/api/resp/botstatus_string.go b/milo/api/resp/botstatus_string.go
new file mode 100644
index 0000000000000000000000000000000000000000..f008fc02e3c8ca27c8a5b0d0b9ba83a674cf2e77
--- /dev/null
+++ b/milo/api/resp/botstatus_string.go
@@ -0,0 +1,16 @@
+// Code generated by "stringer -type=BotStatus"; DO NOT EDIT.
+
+package resp
+
+import "fmt"
+
+const _BotStatus_name = "UnknownIdleBusyDisconnected"
+
+var _BotStatus_index = [...]uint8{0, 7, 11, 15, 27}
+
+func (i BotStatus) String() string {
+	if i < 0 || i >= BotStatus(len(_BotStatus_index)-1) {
+		return fmt.Sprintf("BotStatus(%d)", i)
+	}
+	return _BotStatus_name[_BotStatus_index[i]:_BotStatus_index[i+1]]
+}