As a follow-on to IMPALA-7698, adds various incantations
so that centos:7 can build under test-with-docker.
The core issue is that the centos:7 image doesn't let you start sshd
(necessary for the HBase startup scripts, and probably could be worked
around) or postgresql (harder to work around) with systemctl, because
systemd isn't "running." To avoid this, we start them manually
with /usr/sbin/sshd and pg_ctl.
Change-Id: I7577949b6eaaa2239bcf0fadf64e1490c2106b08
Reviewed-on: http://gerrit.cloudera.org:8080/12139
Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
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