Add initial SQLite-backed state implementation

This contains the implementation of (most) container functions,
with stubs for all pod and volume functions. Presently accessed
via environment variable only for testing purposes.

Signed-off-by: Matt Heon <mheon@redhat.com>

vendor/github.com/mattn/go-sqlite3/sqlite3_opt_stat4.go

@@ -0,0 +1,15 @@
+// Copyright (C) 2019 Yasuhiro Matsumoto <mattn.jp@gmail.com>.
+// Copyright (C) 2018 G.J.R. Timmer <gjr.timmer@gmail.com>.
+//
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file.
+
+// +build sqlite_stat4
+
+package sqlite3
+
+/*
+#cgo CFLAGS: -DSQLITE_ENABLE_STAT4
+#cgo LDFLAGS: -lm
+*/
+import "C"