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Description of problem:
If you do not specify BROADCAST= in config files for alias interfaces, the
broadcast address will be not recalculated if already specified in parent's
interface configuration file.
That's because ifup-aliases evaluates variable from parent interface's
configuration file (somewhere before the declaration of function ini_env()), and
if BROADCAST is already specified in $PARENTCONFIG, a variable default_BROADCAST
is set with parent interface's broadcast, and then ini_env() which is performed
for every alais interface initializes BROADCAST with default_BROADCAST, so [ -z
"$BROADCAST" ] from function new_interface() will return false for every alias
interface, causing BROADCAST not to be recalculated.

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. comment/delete BROADCAST=something line from a primary interface
configuration file, if any (line like this);
2. edit a secondary interface and do not specify the broadcast address.
3. ifup-alias ethX && ip add sh dev ethX:Y.
	

Actual Results:  The broadcast address will be that of the primary interface.

Expected Results:  The broadcast address should be calculated for every
secondary interface.



Additional info: