klient: lazy heartbeats
klient: lazy heartbeats

This PR makes vagrant.* commands start sending heartbeats after
the vagrant command execution is successfuly (in progress).

Also fixes a bug, when heartbeats were stopped right after early return
of the async watchCommand func.

alex-ionochkin/koding,szkl/koding,sinan/koding,rjeczalik/koding,kwagdy/koding-1,kwagdy/koding-1,usirin/koding,usirin/koding,jack89129/koding,szkl/koding,kwagdy/koding-1,kwagdy/koding-1,cihangir/koding,rjeczalik/koding,cihangir/koding,sinan/koding,koding/koding,gokmen/koding,drewsetski/koding,gokmen/koding,sinan/koding,kwagdy/koding-1,sinan/koding,andrewjcasal/koding,drewsetski/koding,koding/koding,jack89129/koding,gokmen/koding,mertaytore/koding,andrewjcasal/koding,acbodine/koding,alex-ionochkin/koding,usirin/koding,koding/koding,acbodine/koding,jack89129/koding,sinan/koding,drewsetski/koding,kwagdy/koding-1,andrewjcasal/koding,cihangir/koding,rjeczalik/koding,alex-ionochkin/koding,mertaytore/koding,jack89129/koding,jack89129/koding,andrewjcasal/koding,mertaytore/koding,mertaytore/koding,koding/koding,alex-ionochkin/koding,szkl/koding,szkl/koding,acbodine/koding,kwagdy/koding-1,acbodine/koding,jack89129/koding,cihangir/koding,usirin/koding,cihangir/koding,koding/koding,cihangir/koding,drewsetski/koding,alex-ionochkin/koding,drewsetski/koding,sinan/koding,gokmen/koding,drewsetski/koding,koding/koding,rjeczalik/koding,andrewjcasal/koding,acbodine/koding,rjeczalik/koding,usirin/koding,andrewjcasal/koding,jack89129/koding,andrewjcasal/koding,gokmen/koding,mertaytore/koding,alex-ionochkin/koding,kwagdy/koding-1,alex-ionochkin/koding,mertaytore/koding,gokmen/koding,sinan/koding,acbodine/koding,koding/koding,drewsetski/koding,szkl/koding,mertaytore/koding,acbodine/koding,sinan/koding,szkl/koding,drewsetski/koding,andrewjcasal/koding,koding/koding,usirin/koding,alex-ionochkin/koding,rjeczalik/koding,gokmen/koding,szkl/koding,mertaytore/koding,szkl/koding,acbodine/koding,gokmen/koding,jack89129/koding,rjeczalik/koding,usirin/koding,usirin/koding,rjeczalik/koding,cihangir/koding,cihangir/koding