Review Request 59219: Removed code for old agents in agent re-registration logic.

[Neil Conway]

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https://reviews.apache.org/r/59219/
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Review request for mesos and Benjamin Mahler.


Bugs: MESOS-6977
    https://issues.apache.org/jira/browse/MESOS-6977


Repository: mesos


Description
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0.x agents are no longer supported.


Diffs
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  src/master/master.cpp 4e7a161f431624bd78d3e9032eb8587687149cad 


Diff: https://reviews.apache.org/r/59219/diff/1/


Testing
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make check


Thanks,

Neil Conway