testdata/bin/kill-all.sh uses /usr/bin/killall, which
is provided by the 'psmisc' package on Ubuntu. This
commit adds the package to the list of packages we install.
The Docker base image for Ubuntu 16.04 doesn't contain this package,
which is how this came up.
Change-Id: I378b6fbfaaaa7a7b3f0b42ecf064e98cfe6e29b3
Reviewed-on: http://gerrit.cloudera.org:8080/8306
Reviewed-by: Jim Apple <jbapple-impala@apache.org>
Tested-by: Impala Public Jenkins
8e6dd8a805