MT#16391 Depend on psmisc

tt2-daemon is stopped via killall in the build and values
action, therefore we need to add psmisc (the package providing
the killall binary) as dependency.

Found while writing the new testsuite.

Change-Id: I6dfbd23b012b588cc1562db05cf1d927da97a13c

debian/control

@@ -51,6 +51,7 @@ Depends: etckeeper,
          netcat | netcat-traditional,
          ngcp-system-tools,
          pkwalify,
+         psmisc,
          ${misc:Depends},
          ${perl:Depends}
 Description: central and templated based Configuration Management System for NGCP platforms