The main motivation for this change is to change the checksum type to a
string for sending it to cta-admin (as opposed to a byte array, used
for communicating with EOS). This allows us to decode the checksum
before sending it which makes things a lot easier for operator scripts
which parse the JSON.

Added RepackDestinationInfos to add informations about where files from a repacked tape have been migrated

This will show up if sq with the option --json. It is allowing the operators to see the effects of backpressure.

CTA catalogue fields to cta-admin tape ls command.

gRPC protobufs are moving to a new EOS submodule, grpc-proto. This is
because they will be shared with CERNBox as well as CTA.

7/6/2019  GRPC: allow to specify a packet size in eos-grpc-ping

Add disk system table support for cta-admin commands "disksystem
add/ls/rm".

tape

Add read only tapes support for cta-admin commands "tape add/ls/ch" and "sq".

OwnerId is numeric type (to store in the DB),
RequesterId stays as strings (for log messages etc.)

This change breaks the API. Both EOS and CTA need to be recompiled
against this version of the submodule.

Tabular output (for humans) always shows headers.
Scripts should use --json.

It is used by ShowQueues as well as drive ls

Scope of enum values is the protobuf message not the individual enum,
so can't define UNKNOWN twice in the same message.