misc: Remove unused fields identified by structcheck

Add structcheck to the list of linters used on travis runs.

ciao-cli/event.go:109:2⚠️ unused struct field github.com/01org/ciao/ciao-cli.eventDeleteCommand.all (structcheck)
ciao-cli/event.go:110:2⚠️ unused struct field github.com/01org/ciao/ciao-cli.eventDeleteCommand.tenant (structcheck)
ciao-cli/external_ips.go:636:2⚠️ unused struct field github.com/01org/ciao/ciao-cli.poolAddCommand.ips (structcheck)
ciao-cli/node.go:43:2⚠️ unused struct field github.com/01org/ciao/ciao-cli.nodeListCommand.nodeID (structcheck)
ciao-controller/client_wrapper_test.go:29:2⚠️ unused struct field github.com/01org/ciao/ciao-controller.ssntpClientWrapper.ctl (structcheck)
qemu/qmp.go:111:2⚠️ unused struct field github.com/01org/ciao/qemu.qmpResult.data (structcheck)
ssntp/ssntp_test.go:193:2⚠️ unused struct field github.com/01org/ciao/ssntp_test.ssntpClient.evtTracedChannel (structcheck)
ssntp/ssntp_test.go:192:2⚠️ unused struct field github.com/01org/ciao/ssntp_test.ssntpClient.staTracedChannel (structcheck)
ssntp/ssntp_test.go:194:2⚠️ unused struct field github.com/01org/ciao/ssntp_test.ssntpClient.errTracedChannel (structcheck)
ssntp/server.go:75:2⚠️ unused struct field github.com/01org/ciao/ssntp.Server.roleVerify (structcheck)
networking/ciao-cnci-agent/client.go:97:2⚠️ unused struct field github.com/01org/ciao/networking/ciao-cnci-agent.agentClient.netCh (structcheck)
testutil/agent.go:37:2⚠️ unused struct field github.com/01org/ciao/testutil.SsntpTestClient.ticker (structcheck)

Signed-off-by: Rob Bradford <robert.bradford@intel.com>

qmp.go

@@ -108,7 +108,6 @@ type QMPEvent struct {
 
 type qmpResult struct {
 	err error
-	data map[string]interface{}
 }
 
 type qmpCommand struct {