Switch product configs from make to ckati

This speeds up dumping make variables from ~380ms using make to ~220ms
using ckati. It also means that we're consistently using the same parser
for builds (with the same .KATI_READONLY/etc extensions).

envsetup.sh (lunch) / other scripts still use make, changing those to go
through soong_ui will be a future change.

Test: m clean; m nothing
Test: USE_GOMA=true m nothing
Test: m PRODUCT-aosp_x86-sdk
Test: m APP-Calculator
Test: build/soong/build_test.bash -only-config  (on AOSP and internal master)
Change-Id: I6ca554de8de4955fb869001d06d29969b75751cc

ui/build/sandbox_linux.go

@@ -19,7 +19,7 @@ type Sandbox bool
 const (
 	noSandbox            = false
 	globalSandbox        = false
-	makeSandbox          = false
+	dumpvarsSandbox      = false
 	soongSandbox         = false
 	katiSandbox          = false
 	katiCleanSpecSandbox = false