provider/aws: Add replace_unhealthy_instances to spot_fleet_request

[stack72]

Fixes: #12635

% make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSSpotFleetRequest_'                                                                    ✹
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/03/14 15:57:08 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSSpotFleetRequest_ -timeout 120m
=== RUN   TestAccAWSSpotFleetRequest_changePriceForcesNewRequest
--- PASS: TestAccAWSSpotFleetRequest_changePriceForcesNewRequest (182.81s)
=== RUN   TestAccAWSSpotFleetRequest_lowestPriceAzOrSubnetInRegion
--- PASS: TestAccAWSSpotFleetRequest_lowestPriceAzOrSubnetInRegion (88.80s)
=== RUN   TestAccAWSSpotFleetRequest_lowestPriceAzInGivenList
--- PASS: TestAccAWSSpotFleetRequest_lowestPriceAzInGivenList (92.50s)
=== RUN   TestAccAWSSpotFleetRequest_lowestPriceSubnetInGivenList
--- PASS: TestAccAWSSpotFleetRequest_lowestPriceSubnetInGivenList (119.25s)
=== RUN   TestAccAWSSpotFleetRequest_multipleInstanceTypesInSameAz
--- PASS: TestAccAWSSpotFleetRequest_multipleInstanceTypesInSameAz (95.23s)
=== RUN   TestAccAWSSpotFleetRequest_multipleInstanceTypesInSameSubnet
--- PASS: TestAccAWSSpotFleetRequest_multipleInstanceTypesInSameSubnet (125.55s)
=== RUN   TestAccAWSSpotFleetRequest_overriddingSpotPrice
--- PASS: TestAccAWSSpotFleetRequest_overriddingSpotPrice (92.24s)
=== RUN   TestAccAWSSpotFleetRequest_diversifiedAllocation
--- PASS: TestAccAWSSpotFleetRequest_diversifiedAllocation (400.04s)
=== RUN   TestAccAWSSpotFleetRequest_withWeightedCapacity
--- PASS: TestAccAWSSpotFleetRequest_withWeightedCapacity (349.51s)
=== RUN   TestAccAWSSpotFleetRequest_withEBSDisk
--- PASS: TestAccAWSSpotFleetRequest_withEBSDisk (86.70s)
=== RUN   TestAccAWSSpotFleetRequest_CannotUseEmptyKeyName
--- PASS: TestAccAWSSpotFleetRequest_CannotUseEmptyKeyName (0.00s)
PASS
ok	github.com/hashicorp/terraform/builtin/providers/aws	1632.663s

[grubernaut]

LGTM

[ghost]

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