r/elasticache_parameter_group: Raise timeout for retry on pending changes

[radeksimko]

This is to address the following test failure:

=== RUN   TestAccAWSElasticacheParameterGroup_removeParam
--- FAIL: TestAccAWSElasticacheParameterGroup_removeParam (23.51s)
    testing.go:492: Step 1 error: Error applying: 1 error(s) occurred:
        
        * aws_elasticache_parameter_group.bar: 1 error(s) occurred:
        
        * aws_elasticache_parameter_group.bar: Error resetting Cache Parameter Group: InvalidCacheParameterGroupState: Cannot reset the parameter group because the parameter appendfsync has pending changes.
            status code: 400, request id: cfb9ec1f-bed1-11e7-9df1-6f235b4356e9

[Ninir]

LGTM!

[ghost]

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