Use qemu-kvm-ev package on centos

For the latest qemu-kvm, you have to use the qemu-kvm-ev package,
which is based off the qemu-kvm-rhev package, which is explained in
[1] but you probably can't read it.  The gist is, that qemu-kvm-rhev
is a later build of kvm that is incompatible with the base version
provided.  qemu-kvm-rhev is only provided with the RHV (ovirt) and
RHOS (openstack) products.  CentOS rebuilds this package as
qemu-kvm-ev as part of it's virtualisation SIG.

I9a972e3fde2e4e552f6fc98350820c07873c3de3 has bumped up the minimum
qemu version to 2.1.0.  It seems there is a an issue (bug #1668164)
where having the qemu-system package installed gets picked up if
installed, and reports the incorrect version to nova, causing failure.

This removes the installs from files/rpms/nova as it is all being done
in function-libvirt.  We only install the qemu-kvm-ev package on
centos and remove the old work-around.

[1] https://access.redhat.com/solutions/629513
[2] https://wiki.centos.org/SpecialInterestGroup/Virtualization

Change-Id: Ide91b261f35fb19d8bd7155ca016fa3b76a45ea1

files/rpms/nova

@@ -9,10 +9,6 @@ iptables
 iputils
 kernel-modules # dist:f23,f24,f25
 kpartx
-kvm # NOPRIME
-libvirt-bin # NOPRIME
-libvirt-devel # NOPRIME
-libvirt-python # NOPRIME
 libxml2-python
 m2crypto
 mysql-devel
@@ -21,7 +17,6 @@ mysql-server # NOPRIME
 numpy # needed by websockify for spice console
 parted
 polkit
-qemu-kvm # NOPRIME
 rabbitmq-server # NOPRIME
 sqlite
 sudo

lib/nova_plugins/functions-libvirt

@@ -34,18 +34,23 @@ function install_libvirt {
         #pip_install_gr <there-si-no-guestfs-in-pypi>
     elif is_fedora || is_suse; then
         # On "KVM for IBM z Systems", kvm does not have its own package
-        if [[ ! ${DISTRO} =~ "kvmibm1" ]]; then
+        if [[ ! ${DISTRO} =~ "kvmibm1" && ! ${DISTRO} =~ "rhel7" ]]; then
             install_package kvm
         fi
-        # there is a dependency issue with kvm (which is really just a
-        # wrapper to qemu-system-x86) that leaves some bios files out,
-        # so install qemu-kvm (which shouldn't strictly be needed, as
-        # everything has been merged into qemu-system-x86) to bring in
-        # the right packages. see
-        # https://bugzilla.redhat.com/show_bug.cgi?id=1235890
-        install_package qemu-kvm
+
+        if [[ ${DISTRO} =~ "rhel7" ]]; then
+            # On centos7 install the qemu-kvm-ev package, which is a
+            # later version of qemu-kvm rebuilt from the qemu-kvm-rhev
+            # package by the virt SIG (as required by nova).  This
+            # package is only provided for RHOS (openstack) or RHV
+            # (ovirt) in RHEL.  We have already insalled the RDO
+            # repositories which provide this.
+            install_package qemu-kvm-ev
+        fi
+
         install_package libvirt libvirt-devel
         pip_install_gr libvirt-python
+
     fi
 }