Description of problem:

The /proc/interrupts format changed a bit in the newer kernels adding an extra column.
This is how it used to be:
 43:  0   0   0   0   PCI-MSI-edge  virtio0-input.0
This is how it is now:
 43:  0   0   0   0   PCI-MSI 32769-edge  virtio0-input.0

The extra column breaks the 'users' parser.  As a consequence tuna breaks too.

# tuna --irqs='virtio0*' --cpus=0,1,2,3  -x
[]
tuna: --move requires a list of threads/irqs!
[root@localhost ~]# tuna --irqs='*virtio0*' --cpus=0,1,2,3  -x
[32, 33, 34, 26, 27, 28, 29, 30, 31]

Version-Release number of selected component (if applicable):
tuna-0.11.1-8.el7.noarch
python-linux-procfs-0.4.6-2.el7.noarch
Good kernel: 3.10.0-252.el7.x86_64
Bad kernel: vmlinuz-4.1.0-05824-gb922622

How reproducible:
Always, just reboot a guest using the bad kernel version.

Actual results:
tuna regex for irq users is broken

Expected results:
both kernels are supported and the same regex applies.

Additional info:
The bad kernel might not be supported at this moment, but it is useful for testing and might be the case of more advanced kernels, like kernel-rt. In any case, this needs to be fixed to prevent customers to find it later on when the supported kernel gets updated too.