Set the execution bit on /usr/sbin/{ifup,ifdown} ghost files to match
the mode of same files installed by initscripts.

Otherwise, they will appear as changed according to rpm verify:

 .M.......  g /usr/sbin/ifdown
 .M.......  g /usr/sbin/ifup

when the alternatives mechanism is not in place.

 # ll /usr/sbin/if{up,down}
 -rwxr-xr-x. 1 root root 1651 Aug 24 06:23 /usr/sbin/ifdown
 -rwxr-xr-x. 1 root root 5010 Aug 24 06:23 /usr/sbin/ifup

https://bugzilla.redhat.com/show_bug.cgi?id=1626517