vircgroup.c: add virCgroupSetupBlkioDevice* helpers
The current use of the functions that set and get BlkioDevice attributes is doing a set(), followed by a get() of the same parameter right after. This is done because there is no guarantee that the kernel will accept the desired value given by the set() call, thus we need to execute a get() right after to get the actual value. This patch adds helpers inside vircgroup.c to execute these operations. Next patch will use these helpers to reduce code repetition in LXC and QEMU files. Signed-off-by: NDaniel Henrique Barboza <danielhb413@gmail.com> Signed-off-by: NJán Tomko <jtomko@redhat.com> Reviewed-by: NJán Tomko <jtomko@redhat.com>
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