VPC ID Filter is added when Subnet Name is specified

[SunithaGudisagarIBM1]

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Relates OR Closes #4872

Output from acceptance testing:

resource "ibm_is_vpc" "testacc_vpc" {
	name = "sunitha-vpc"
}

resource "ibm_is_subnet" "testacc_subnet" {
	name = "sunitha-subnet"
	vpc = "${ibm_is_vpc.testacc_vpc.id}"
	zone = "us-south-1"
	total_ipv4_address_count = 16
}
data "ibm_is_subnet" "ds_subnet" {
	identifier = "${ibm_is_subnet.testacc_subnet.id}"
}

data "ibm_is_subnet" "ds_subnet_name" {
  depends_on = [ ibm_is_subnet.testacc_subnet ]
	name =   "sunitha-subnet"
}

data "ibm_is_subnet" "ds_subnet_vpcid_subentname" {
  depends_on = [ ibm_is_subnet.testacc_subnet ]
  name =   "sunitha-subnet"
  vpc =  "${ibm_is_vpc.testacc_vpc.id}"
}

	data "ibm_is_subnets" "ds_subnets_resource_group" {
		/* depends_on = [ibm_is_subnet.testacc_subnet] */
		/* vpc = ibm_is_vpc.testacc_vpc.id */
    vpc_name = "tfp-vpc"
    		/* resource_group = "11caaa983d9c4beb82690daab08717e9" */

	}