Commit b21373d0 copied wait_command() from tests/migration-test.c
to tests/tpm-util.c.  Replace both copies by new libqtest helper
qtest_qmp_receive_success().  Also use it to simplify
qtest_qmp_device_del().

Bonus: gets rid of a non-literal format string.  A step towards
compile-time format string checking without triggering
-Wformat-nonliteral.

Cc: Thomas Huth <thuth@redhat.com>
Cc: Juan Quintela <quintela@redhat.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: Stefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Reviewed-by: NJuan Quintela <quintela@redhat.com>
Reviewed-by: NStefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Message-Id: <20180806065344.7103-17-armbru@redhat.com>