provider/aws: Add import to codecommit_repository

[grubernaut]

Adds import capability to the aws_codecommit_repository resource.

Also fixes an issue in the Read function where both description and resource_name attributes weren't being updated and set in the Schema.

Fixes: #13559

$ make testacc TEST=./builtin/providers/aws TESTARGS="-run=TestAccAWSCodeCommitRepository"
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/04/12 10:14:44 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSCodeCommitRepository -timeout 120m
=== RUN   TestAccAWSCodeCommitRepository_importBasic
--- PASS: TestAccAWSCodeCommitRepository_importBasic (16.11s)
=== RUN   TestAccAWSCodeCommitRepository_basic
--- PASS: TestAccAWSCodeCommitRepository_basic (14.97s)
=== RUN   TestAccAWSCodeCommitRepository_withChanges
--- PASS: TestAccAWSCodeCommitRepository_withChanges (26.71s)
=== RUN   TestAccAWSCodeCommitRepository_create_default_branch
--- PASS: TestAccAWSCodeCommitRepository_create_default_branch (14.34s)
=== RUN   TestAccAWSCodeCommitRepository_create_and_update_default_branch
--- PASS: TestAccAWSCodeCommitRepository_create_and_update_default_branch (27.90s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    100.071s

[catsby]

👍

[ghost]

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