pool: separate cases for disk error and no space available #7731
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Motivation
when there are no avvailable space on a pool, the pool will go to DISABLED mode and no data could be read anymore.
This is wrong we still want to be able to read data from the file.
Modification
this is a temp change, trying to get the info from the eroor message, sice therer is no a specific error code,
and then based on that info separate two cases DISABLED AND READONLY
Acked-by: Tigran Mkrtchyan
Target: master. 10.2, 10.1, 10.0, 9.2
Require-book: no
Require-notes: yes
Commited:master@862963e