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Updates gRPC protobuf for CASTOR migration tools
cta/CTA#533 Retrieve disk system backpressure Add disk system table support for cta-admin commands "disksystem add/ls/rm".
Add read only tapes support for cta-admin commands "tape add/ls/ch" and "sq".
Adds messages for cta-admin "showqueues" and "admin ls"
Added SUPPLY OptionString to cta_admin.proto
Added supply field to the TapePoolLsItem message.
Removes workaround code for xrootd Service::Stop()
Adds ChecksumBlob message (deprecates Checksum message)
Changes disk owner user/group from string to integer type
Removed BooleanOption::LBP
Increases default stream buffer size to 16 Kb
Fixes #368: delete stream object when stream finishes processing