There used to be some component that installed Cockpit (and specifically the oVirt related stuff on top of it) on a host during its installation (deps of VDSM?). 
Therefore, I removed the explicit installation of cockpit[1].
But now I see it's not installed eventually. 
To make things a bit more interesting, this is what I see in /var/log/yum.log on the host:

Sep 13 02:37:25 Installed: vdsm-4.20.3-27.git4fb1e37.el7.centos.x86_64
...
Sep 13 02:37:27 Installed: cockpit-ovirt-dashboard-0.11.1-0.0.master.el7.centos.noarch
Sep 13 02:37:27 Installed: ovirt-hosted-engine-setup-2.2.0-0.0.master.20170911115315.git10a8a00.el7.centos.noarch
Sep 13 02:37:27 Installed: ovirt-host-4.2.0-0.0.master.20170831125019.gitfec198b.el7.centos.noarch
...
Sep 13 02:37:51 Erased: cockpit-ovirt-dashboard-0.11.1-0.0.master.el7.centos.noarch
Sep 13 02:37:51 Erased: ovirt-hosted-engine-setup-2.2.0-0.0.master.20170911115315.git10a8a00.el7.centos.noarch
Sep 13 02:37:51 Erased: ovirt-host-4.2.0-0.0.master.20170831125019.gitfec198b.el7.centos.noarch
Sep 13 02:37:52 Erased: iptables-services-1.4.21-17.el7.x86_64


Any idea why/who?
Y.
[1] https://gerrit.ovirt.org/#/c/73490/