Focal oem-5.6/oem-5.6-next rebased

[Tim Gardner]

Several patches had the wrong author and commit date. The new commits are:

26e622d127db5569b78725688aaaaa3c0b72d021 fix regression in "epoll: Keep 
a reference on files added to the check list"
fd9b503a05a0b1bea7582df1d599345731239b32 do_epoll_ctl(): clean the 
failure exits up a bit
b89b7f68582e95fb8bca52a0a38c6242b6441a67 epoll: Keep a reference on 
files added to the check list

rtg
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Tim Gardner
Canonical, Inc