HDDS-7003. Tweak read-replicas tool to be compatible with EC replication type

[len548]

What changes were proposed in this pull request?

The ozone debug read-replicas command creates a directory with downloaded replicas of a given key and a manifest file in it. Currently in case of an EC key, it shows an exception message in the manifest file.

The cause of this issue comes from the getKeysEveryReplica method in RPCClient class. In this method createInputStream method creates an input stream through BlockInputStreamFactory. BlockInputStreamFactory creates a different input stream based on replication type. If the replication type is EC, it creates ECBlockInputStream, otherwise BlockInputStream is created. The error occurs when ECBlockInputStream is read. To download EC replicas, alternatively we can use BlockInputStream instead of ECBlockInputStream. That is why this patch handles this issue by setting the replication type to RATIS ONE even if the key is EC replicated so that BlockInputStream is used instead of ECBlockInputStream.
Also the length of blocks of an EC key has to be calculated properly in getKeysEveryReplica method, this patch introduces internalBlockLength method to determine the length of each block.

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/HDDS-7003

How was this patch tested?

Added robot tests and ran them successfully.

[dombizita]

Thanks for working on this @len548, this is a nice improvement to the read-replicas tool! Please take a look at my suggestions.

[len548]

Thank you for reveiws, @weimingdiit and @dombizita. I hope my comments answer your questions.

[dombizita]

@len548 Please resolve the conflicts, otherwise it looks good to me!

[fapifta]

Thank you for working on this one @len548 it looks good, let's get this in if CI goes through green.

[adoroszlai]

Thanks @len548 for the patch, @dombizita, @fapifta, @peterxcli, @weimingdiit for the review.