provider/aws: Increase timeouts for ELB

[radeksimko]

This is to eliminate the following test failure:

=== RUN   TestAccAWSLoadBalancerBackendServerPolicy_basic
--- FAIL: TestAccAWSLoadBalancerBackendServerPolicy_basic (64.89s)
    testing.go:273: Step 0 error: Error applying: 1 error(s) occurred:
        
        * aws_elb.test-lb: 1 error(s) occurred:
        
        * aws_elb.test-lb: timeout while waiting for state to become 'success' (timeout: 1m0s)

Test plan

make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSLoadBalancerBackendServerPolicy_basic'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/03/29 16:42:48 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSLoadBalancerBackendServerPolicy_basic -timeout 120m
=== RUN   TestAccAWSLoadBalancerBackendServerPolicy_basic
--- PASS: TestAccAWSLoadBalancerBackendServerPolicy_basic (124.74s)
PASS
ok  	github.com/hashicorp/terraform/builtin/providers/aws	124.774s

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