Passing AWSCredentialsProvider to TcpDiscoveryS3IpFinder

TcpDiscoveryS3IpFinder accepts credentials in a form of AWSCredentials only. This might not be enough for all the cases. In a situation when the credentials get expired a special instance of AWSCredentialsProvider can renew them automatically.

However, the credentials will not be updated if StaticCredentialsProvider is used. This provider is created automatically if user provides raw AWSCredentials.

We need to add new method to TcpDiscoveryS3IpFinder that will accept AWSCredentialsProvider:

    public void setAwsCredentialsProvider(AWSCredentialsProvider provider) {

A new test has to be added to TcpDiscoveryS3IpFinderSelfTest as well.

For more details refer to a discussion on the user list:
http://apache-ignite-users.70518.x6.nabble.com/Old-AWS-SDK-version-why-td9824.html