selinux: refactor avtab_node comparisons

In four separate functions within avtab, the same comparison logic is
used. The only difference is how the result is handled or whether there
is a unique specifier value to be checked for or used.

Extracting this functionality into the avtab_node_cmp() function unifies
the comparison logic between searching and insertion and gets rid of
duplicative code so that the implementation is easier to maintain.

Signed-off-by: Jacob Satterfield <[email protected]>
Reviewed-by: Stephen Smalley <[email protected]>
Signed-off-by: Paul Moore <[email protected]>

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