[Merge] ~ubuntu-server-dev/ubuntu/+source/percona-xtradb-cluster-5.7:jp-review-fixes into ~ubuntu-server-dev/ubuntu/+source/percona-xtradb-cluster-5.7:master

[ChristianEhrhardt]

Review: Needs Information

isamchk changes are
1. not grouped commits make it unessesary hard to read
   606256ed8df3fc8471cadd249ab523f5887e2b15 adds
   50a7078f8b49ee6faaa8b8ae4a11876b4823567d is a revert but isn't called that way
   748b78998419147838e83459bd7473adcd8fcdd4 adds a conf in debian dir, but
    - not used in d/* to be installed
    - not listed in changelog what the change is for

sorry need to abort, but in general some cleanup would help review I think?
-- 
https://code.launchpad.net/~ubuntu-server-dev/ubuntu/+source/percona-xtradb-cluster-5.7/+git/percona-xtradb-cluster-5.7/+merge/337000
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