Add 'lsof' to bootstrap_system.

"be/src/kudu/security/test/mini_kdc.cc" uses lsof, which
doesn't exist on the base ubuntu:16.04 Docker image; adding
it in.

Change-Id: I6a458f2ef0313b2d08d6dd21290f8a38fa6d07f7
Reviewed-on: http://gerrit.cloudera.org:8080/8813
Reviewed-by: Tim Armstrong <tarmstrong@cloudera.com>
Tested-by: Impala Public Jenkins
diff --git a/bin/bootstrap_system.sh b/bin/bootstrap_system.sh
index 92b5114..08a93aa 100755
--- a/bin/bootstrap_system.sh
+++ b/bin/bootstrap_system.sh
@@ -106,7 +106,8 @@
 apt-get --yes install ccache g++ gcc libffi-dev liblzo2-dev libkrb5-dev \
         krb5-admin-server krb5-kdc krb5-user libsasl2-dev libsasl2-modules \
         libsasl2-modules-gssapi-mit libssl-dev make maven ninja-build ntp \
-        ntpdate python-dev python-setuptools postgresql ssh wget vim-common psmisc
+        ntpdate python-dev python-setuptools postgresql ssh wget vim-common psmisc \
+        lsof
 
 if ! { service --status-all | grep -E '^ \[ \+ \]  ssh$'; }
 then