storage: remove go1.10 tag from build

This tag is not yet valid. Rename the tagged file for now.

Change-Id: I8d28b84c091a8c085d419ad89544de53d419b734
Reviewed-on: https://code-review.googlesource.com/16730
Reviewed-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
diff --git a/storage/go110.go b/storage/go110.go.pending
similarity index 100%
rename from storage/go110.go
rename to storage/go110.go.pending