flow: stop timer of gopacket
flow: stop timer of gopacket

Change-Id: I3b03c79991a2935c84aac525193b94486889af64
Reviewed-on: http://softwarefactory-project.io/r/5292
Reviewed-by: Nicolas PLANEL <2ba60255afd05ede961f6b959482fc724759f990@redhat.com>
Reviewed-by: Sylvain Baubeau <b0a7dc08a3f38d713e107103b0a85b0badc14b84@redhat.com>
Tested-by: Nicolas PLANEL <2ba60255afd05ede961f6b959482fc724759f990@redhat.com>
Workflow: Nicolas PLANEL <2ba60255afd05ede961f6b959482fc724759f990@redhat.com>
Tested-by: Jenkins CI <d95b56ce41a2e1ac4cecdd398defd7414407cc08@softwarefactory-project.io>

skydive-project/skydive,lebauce/skydive,skydive-project/skydive,redhat-cip/skydive,lebauce/skydive,skydive-project/skydive,safchain/skydive,lebauce/skydive,lebauce/skydive,safchain/skydive,safchain/skydive,skydive-project/skydive,skydive-project/skydive,skydive-project/skydive,safchain/skydive,safchain/skydive,lebauce/skydive,safchain/skydive,redhat-cip/skydive,lebauce/skydive,lebauce/skydive,redhat-cip/skydive,safchain/skydive,skydive-project/skydive,lebauce/skydive,safchain/skydive