[libvirt] [RFC 1/5]: Return exitstatus from virStorageBackendRunProgRegex

[Chris Lalancette]

This patch changes things around so that virStorageBackendRunProgRegex() does
*not* virStorageReportError() if the fork()/exec() process it spawned returned a
!= 0 exit code.  Rather, it returns the exitcode in this case, and it is up to
the higher level to determine whether this is a fatal error or not.  The use
case for this change is in the iSCSI stuff; older versions of iscsiadm tools
would return a failure when getting the session number, despite the command
succeeding.

Signed-off-by: Chris Lalancette <clalance at redhat.com>

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