Update Cloud Spanner sample to use latest client.#1256

Merged

jsimonweb merged 3 commits intoGoogleCloudPlatform:masterfrom

jsimonweb:updateSpannerClientUsage

Nov 13, 2018

Commits on Nov 9, 2018

Update Cloud Spanner sample to use latest client.
jsimonweb
committed

Commits on Nov 12, 2018

Update additional methods to use new client.
jsimonweb
committed

Commits on Nov 13, 2018

Address review comments.
jsimonweb
committed