provider/aws: Increase timeout for retrying creation of CW log subs

[radeksimko]

This is to address the following test failure:

=== RUN   TestAccAWSCloudwatchLogSubscriptionFilter_basic
--- FAIL: TestAccAWSCloudwatchLogSubscriptionFilter_basic (21.29s)
    testing.go:280: Step 0 error: Error applying: 1 error(s) occurred:
        
        * aws_cloudwatch_log_subscription_filter.test_lambdafunction_logfilter: 1 error(s) occurred:
        
        * aws_cloudwatch_log_subscription_filter.test_lambdafunction_logfilter: InvalidParameterException: Could not execute the lambda function. Make sure you have given CloudWatch Logs permission to execute your function.
            status code: 400, request id: df554472-3eb1-11e7-a06d-195b209438c3

[stack72]

LGTM

[ghost]

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