Add a new helper functions for _{flatten,get}_array

A new helper function (_array_helper) since both, the _flatten_array and
_get_array function share partially the same code.
We also reduce multiple whitespace to a single space, remove leading newlines
as well as skipping "empty" lines.

This makes the data returned by _{flatten,get}_array much nicer than before.
It also fixes bug 366677 where net-tools having trouble with the whitespace
mentioned above. iproute2 was not affected.

Reported-by: Andrew Maltsev <am@ejelta.com>
X-Gentoo-Bug: 366677
X-Gentoo-Bug-URL: https://bugs.gentoo.org/366677

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