cdn_profile resource was using `Profiles` instead of `profiles` to gather the
name in the read and delete methods, added importing capability with test to
confirm read now works as expected.
```
TF_ACC=1 go test ./builtin/providers/azurerm -v -run TestAccAzureRMCdnProfile -timeout 120m
=== RUN TestAccAzureRMCdnProfile_importWithTags
--- PASS: TestAccAzureRMCdnProfile_importWithTags (170.00s)
=== RUN TestAccAzureRMCdnProfile_basic
--- PASS: TestAccAzureRMCdnProfile_basic (166.33s)
=== RUN TestAccAzureRMCdnProfile_withTags
--- PASS: TestAccAzureRMCdnProfile_withTags (185.94s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/azurerm 522.333s
```
