Introduce cache_inode_details
Introduce cache_inode_details

cache_inode_details gives a way to obtain cache information without printing it.

* socketutils.c (cache_inode_details): New function.
(inet_parse_response, unix_parse_response, netlink_parse_response):
Call cache_inode_details().
(inet_print, unix_print, netlink_print): Call print_sockaddr_by_inode_cached().

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