bridge: Read internal cgroup metrics as integers
bridge: Read internal cgroup metrics as integers

cgroupv1's cpu and memory controllers all have integer values, see
documentation [1], and

    echo 1052.4 > cpu.shares
    -bash: echo: write error: Invalid argument

Also, cockpit_samples_sample() takes a gint64 value.

So cut out the int → double → int conversion, and use gint64
consistently.

[1] https://github.com/torvalds/linux/tree/master/Documentation/admin-guide/cgroup-v1

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