spot instance request launch group

[Harrison-Miller]

Added an option for setting the launch group when creating a spot instance request.

[stack72]

This LGTM! Thanks for the work here:

% make testacc TEST=./aws TESTARGS='-run=TestAccAWSSpotInstanceRequest_'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -run=TestAccAWSSpotInstanceRequest_ -timeout 120m
=== RUN   TestAccAWSSpotInstanceRequest_basic
--- PASS: TestAccAWSSpotInstanceRequest_basic (100.60s)
=== RUN   TestAccAWSSpotInstanceRequest_withLaunchGroup
--- PASS: TestAccAWSSpotInstanceRequest_withLaunchGroup (110.29s)
=== RUN   TestAccAWSSpotInstanceRequest_withBlockDuration
--- PASS: TestAccAWSSpotInstanceRequest_withBlockDuration (87.14s)
=== RUN   TestAccAWSSpotInstanceRequest_vpc
--- PASS: TestAccAWSSpotInstanceRequest_vpc (138.89s)
=== RUN   TestAccAWSSpotInstanceRequest_SubnetAndSGAndPublicIpAddress
--- PASS: TestAccAWSSpotInstanceRequest_SubnetAndSGAndPublicIpAddress (236.03s)
=== RUN   TestAccAWSSpotInstanceRequest_NetworkInterfaceAttributes
--- PASS: TestAccAWSSpotInstanceRequest_NetworkInterfaceAttributes (244.66s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	917.637s

[ghost]

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