* qemud/libvirtd_qemu.aug, qemud/test_libvirtd_qemu.aug,
src/qemu.conf: Add 'cgroups_controllers' and 'cgroups_device_acl'
parameters
* src/qemu_conf.h, src/qemu_conf.c: Load & parse configuration params
for cgroups
* src/qemu_driver.c: Only use cgroups controllers that are activated,
and use configured device whitelist instead of default, if set.
* src/qemu_driver.c: Set a restrictive block device whitelist for
all QEMU guests. Update whitelist when hotplugging disks.
* src/cgroup.h, src/cgroup.c: Add some more convenience methods
for dealing with block device whitelists.
* src/qemu_driver.c: Add driver methods qemuGetSchedulerType,
qemuGetSchedulerParameters, qemuSetSchedulerParameters
* src/lxc_driver.c: Fix to use unsigned long long consistently
for schedular parameters
* src/cgroup.h, src/cgroup.c: Fix cpu_shares to take unsigned
long long
* src/util.c, src/util.h, src/libvirt_private.syms: Add a
virStrToDouble helper
* src/virsh.c: Fix handling of --set arg to schedinfo command
to honour the designated data type of each schedular tunable
as declared by the driver
Allow the driver level cgroup to be managed explicitly by the
hypervisor drivers, in order to detect whether to enable or
disable cgroup support for domains. Provides better error
reporting of failures. Also allow for creation of cgroups for
unprivileged drivers if controller is accessible by the user.
* src/cgroup.c, src/cgroup.h: Add an API to obtain a driver cgroup
* src/lxc_conf.h, src/lxc_controller.c, src/lxc_driver.c:
Obtain a driver cgroup at startup and use that instead of
re-creating everytime.
* src/util.c, src/util.h, src/libvirt_private.syms: Add a
virGetUserName() helper
