Revert "testnode: install QEMU packages on Fedora, RHEL, and CentOS"

[vasukulkarni]

@dillaman @andrewschoen

This has dependency on librados2 and librbd1 and endsup installing older version either on rhel or on fedora, Since @ceph provides the right version of librados and rbd, it should be the main source. I think it might be better to handle this at the later stage.

Check here for logs: http://fpaste.org/291685/18351144/

Reverts #153

[vasukulkarni]

@dillaman is this package only required for rbd/qemu suite? we can add the ansible task there to install qemu-kvm after the install task, with this installed before install task it will have older version which is not overwritten for some distro.

[dillaman]

@vasukulkarni I don't think a straight revert is the correct answer since Ubuntu does install qemu at this stage (which also will pull in librbd / librados). You should keep the OSes consistent.

[vasukulkarni]

@dillaman agree, I think it should be removed for ubuntu as well and add it after Ceph install, if you want to do it differently that is fine as well.

[dillaman]

@vasukulkarni I'm fine with that approach -- but in that case, this PR should include a commit to remove the Ubuntu QEMU install and another commit for a new ansible task to install QEMU on all OSes which can be invoked via the teuthology task.

[vasukulkarni]

@dillaman sure, I will include the ubuntu commit, will check with @zmc and @andrewschoen on ansible task that can used to install dependency packages for tests which can be all committed together.

[wusui]

I believe that the problems in http://tracker.ceph.com/issues/13881 may be happening due to this change not being implemented.

[wusui]

Note: The problem reported in my previous comment happens on trusty, so qemu-system-x86 should probably also be removed from at least the ubuntu_15.yml file as well (and probably others too).