Support direct endpoints for cos_bucket

[kavya498]

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Relates OR Closes #3230

Output from acceptance testing:

=== RUN   TestAccIBMCosBucket_Basic
--- PASS: TestAccIBMCosBucket_Basic (100.73s)
=== RUN   TestAccIBMCosBucket_ActivityTracker_Monitor
--- PASS: TestAccIBMCosBucket_ActivityTracker_Monitor (99.11s)
=== RUN   TestAccIBMCosBucket_Retention
--- PASS: TestAccIBMCosBucket_Retention (67.45s)
=== RUN   TestAccIBMCosBucket_Object_Versioning
--- PASS: TestAccIBMCosBucket_Object_Versioning (57.64s)
=== RUN   TestAccIBMCosBucket_Hard_Quota
--- PASS: TestAccIBMCosBucket_Hard_Quota (63.92s)
=== RUN   TestAccIBMCosBucket_Smart_Type
--- PASS: TestAccIBMCosBucket_Smart_Type (96.51s)
=== RUN   TestAccIBMCosBucket_import
--- PASS: TestAccIBMCosBucket_import (76.97s)

...

resource "ibm_cos_bucket" "standard-ams03" {
  bucket_name          = "kavya1234ndard-bucket-at-ams"
  resource_instance_id = ibm_resource_instance.cos_instance.id
  single_site_location = "ams03"
  storage_class        = "standard"
  endpoint_type = "direct"
}

ibm_cos_bucket.standard-ams03: Creating...
ibm_cos_bucket.standard-ams03: Creation complete after 8s [id=crn:v1:bluemix:public:cloud-object-storage:global:a/4448261269a14562b839e0a3019ed980:0652d66d-503e-404a-9d9c-973bb5137d2f:bucket:kavya1234ndard-bucket-at-ams:meta:ssl:ams03:direct]

Apply complete! Resources: 1 added, 0 changed, 0 destroyed.