EX-3548 lipe: lamigo changelog handling

EX-3548 lipe: lamigo changelog handling

In lamigo, register a named changelog user if no suitable user already
exists. Print error messages in cases where lamigo appears to have
registered multiple changelog users. Add a test that lamigo registers
a named user. Add stratagem-hp-deregister-changelogs.sh to find and
remove lamigo registered changelogs on the local node and adjust files
accordingly. Call stratagem-hp-deregister-changelogs.sh from
stratagem-hp-teardown.sh.

Test-Parameters: trivial testlist=hot-pools
Signed-off-by: John L. Hammond <jhammond@whamcloud.com>
Change-Id: I95330b4d6b7877f162d941af95c7332c927b5af2
Reviewed-on: https://review.whamcloud.com/45170
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Alexandre Ioffe <aioffe@ddn.com>
Reviewed-on: https://review.whamcloud.com/46099
Tested-by: Maloo <maloo@whamcloud.com>