NEXUS-5898: Retry for LocalStorageEx too

As those might come from "real" local IO problem
(nx process unable to write to disk), but also from
remote IO problem, when the response body is attempted
to be read to have it cached/stored on disk.

Issue:
https://issues.sonatype.org/browse/NEXUS-5898

CI:
is currently 0xdeadbeef