Added new array APIs that also work with non-arrays.

Similar to how C pointers to variables can always be considered as
pointers to the first element of an array of size 1 (see the
following code for an example of how they are equivalent),
treating non-NXT_CONF_VALUE_ARRAY as if they were
NXT_CONF_VALUE_ARRAYs of size 1 allows for simpler and more
generic code.

	void foo(ptrdiff_t sz, int arr[sz])
	{
		for (ptrdiff_t i = 0; i < sz; i++)
			arr[i] = 0;
	}

	void bar(void)
	{
		int  x;
		int  y[1];

		foo(1, &x);
		foo(1, y);
	}

nxt_conf_array_elements_count_or_1():
	Similar to nxt_conf_array_elements_count().
	Return a size of 1 when input is non-array, instead of
	causing undefined behavior.  That value (1) makes sense
	because it will be used as the limiter of a loop that
	loops over the array and calls
	nxt_conf_get_array_element_or_itself(), which will return
	a correct element for such loops.

nxt_conf_get_array_element_or_itself():
	Similar to nxt_conf_get_array_element().
	Return the input pointer unmodified (i.e., a pointer to
	the unique element of a hypothetical array), instead of
	returning NULL, which wasn't very useful.

nxt_conf_array_qsort():
	Since it's a no-op for non-arrays, this API can be reused.

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