I booted with the 4.0.0 kernel then:
cd /boot dracut "initramfs-4.2.0-0.rc2.git0.1.centos.el7.armv7hl.img" vmlinuz-4.2.0-0.rc2.git0.1.centos.el7.armv7hl
And there was the message:
Kernel version vmlinuz-4.2.0-0.rc2.git0.1.centos.el7.armv7hl has no module directory /lib/modules/vmlinuz-4.2.0-0.rc2.git0.1.centos.el7.armv7hl
The second argument to dracut should be the kernel version, the exact name of the directory as it is in /lib/modules
I looked there and did not see what to install to get this yum plugin.
You will need a new image generated with RBF to use the plugin. You could add files to /etc manually but that could become messy. To use the yum plugin, all you have to do is copy it to the /usr/lib/yum-plugins and the conf file to /etc/yum/pluginconf.d/
Regards Mandar Joshi