UI 35145 os image user data format

[SunithaGudisagarIBM1]

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Relates OR Closes #0000

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

data "ibm_is_images" "ds_images" {
  visibility = "public"
}
data "ibm_is_image" "test1" {
  identifier = "r134-19bc437d-ad0f-462c-8281-a7c7933d9701"
}

data "ibm_is_operating_system" "example" {
  name = "centos-7-amd64"
}

data "ibm_is_operating_systems" "example" {
}