jbjohnso 05e6a27704 Refactor get_interfaces internal function.
First off, have it called outside a loop to avoid many invocations of 'ip'
Secondly, IPv4 multicast demands local ip address, extract those too

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@11899 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd
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