provider/digitalocean: trim whitespace from ssh key

[tam7t]

Fixes #7889

whitespace is trimmed from public_key when retrieving from the DigitalOcean API, resulting in the resource being recreated every run.

[stack72]

Hi @tam7t

Thanks for the fix here :) This LGTM!

% make testacc TEST=./builtin/providers/digitalocean TESTARGS='-run=TestAccDigitalOceanSSHKey_'
==> Checking that code complies with gofmt requirements...
/Users/stacko/Code/go/bin/stringer
go generate $(go list ./... | grep -v /terraform/vendor/)
2016/08/14 21:37:32 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/digitalocean -v -run=TestAccDigitalOceanSSHKey_ -timeout 120m
=== RUN   TestAccDigitalOceanSSHKey_importBasic
--- PASS: TestAccDigitalOceanSSHKey_importBasic (3.06s)
=== RUN   TestAccDigitalOceanSSHKey_Basic
--- PASS: TestAccDigitalOceanSSHKey_Basic (1.48s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/digitalocean   4.548s

Paul

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