fix(client): Fix client using localhost for chunkservers

[uristdwarf]

When master gives information regarding chunks and chunkservers, it may give the localhost ip addresses of chunkserver to client, causing the client to search for the chunks on their localhost. This commit fixes that by interpreting localhost from master to mean the master IP address.

[rolysr]

LGTM. But consider my minor suggestions for code readabilty. On the other hand, did you considered if it is necessary to add a test for checking the fix of the issue that was happening before? Just for checking there is not edge case failing for this.

[ralcolea]

LGTM. Please, consider adding an automated test where at least one chunkserver use localhost as IP to validate the change.

[uristdwarf]

LGTM. Please, consider adding an automated test where at least one chunkserver use localhost as IP to validate the change.

I tried adding one, but it isn't simple (with our current testing framework). This problem occurs because of a client on a different host.

You have chunkserver/master on host A, and client on host B. Master returns the chunkserver ip address relative to it's own address on host B. However with the testing framework everything is tested on the single host, where this bug doesn't happen. If I researched this more I'm sure I could find a way to emulate this behavior, but I don't think it's worth the time or effort

[uristdwarf]

If I researched this more I'm sure I could find a way to emulate this behavior, but I don't think it's worth the time or effort

At least not for this PR, which is my personal contribution I made because I found and fixed it in my spare time.