provider/aws: Refresh aws_route from state if aws_route_table not found

[stack72]

Fixes #5288
Fixes #8388

% make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSRoute_'                                                  2 ↵
==> Checking that code complies with gofmt requirements...
/Users/stacko/Code/go/bin/stringer
go generate $(go list ./... | grep -v /terraform/vendor/)
2016/08/24 12:46:03 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSRoute_ -timeout 120m
=== RUN   TestAccAWSRoute_basic
--- PASS: TestAccAWSRoute_basic (56.87s)
=== RUN   TestAccAWSRoute_changeCidr
--- PASS: TestAccAWSRoute_changeCidr (88.89s)
=== RUN   TestAccAWSRoute_noopdiff
--- PASS: TestAccAWSRoute_noopdiff (143.36s)
=== RUN   TestAccAWSRoute_doesNotCrashWithVPCEndpoint
--- PASS: TestAccAWSRoute_doesNotCrashWithVPCEndpoint (76.67s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    365.810s

[kwilczynski]

@stack72 looks good!

[mitchellh]

LGTM!

[ghost]

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