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b6fc9de14a
both STDOUT and STDERR are written into `$info` which is then parsed for
IP and port of the target socket listening.
when the ports file can't be locked immediately `trying to acquire
lock...` is printed on STDERR and in turn written into `$info`.
trying to parse the IP then fails, resulting in a migration or
replication failing.
the bare open3 call is replaced by the run_command wrapper from
pve-common to use a safe wrapper around open3 with the same
functionality.
STDERR is read separatey from STDOUT and the last line of STDERR is
kept in case of errors.
Fixes: 57acd6a ("fix #1452: also log stderr of remote command with
insecure storage migration")
Signed-off-by: Mira Limbeck <m.limbeck@proxmox.com>