[VOL-2235] Mocks and interfaces for rw-core

This update consists of mocks that are used by the rw-core
during unit testing.  It also includes interfaces used for unit
tests.

Change-Id: I20ca1455c358113c3aa897acc6355e0ddbc614b7
diff --git a/vendor/go.etcd.io/bbolt/bolt_ppc.go b/vendor/go.etcd.io/bbolt/bolt_ppc.go
new file mode 100644
index 0000000..6980471
--- /dev/null
+++ b/vendor/go.etcd.io/bbolt/bolt_ppc.go
@@ -0,0 +1,12 @@
+// +build ppc
+
+package bbolt
+
+// maxMapSize represents the largest mmap size supported by Bolt.
+const maxMapSize = 0x7FFFFFFF // 2GB
+
+// maxAllocSize is the size used when creating array pointers.
+const maxAllocSize = 0xFFFFFFF
+
+// Are unaligned load/stores broken on this arch?
+var brokenUnaligned = false