Rework r2rfast (bb#710)

Take dest hosts from different tempfile. This is the same file that was used for getting download hosts. Now only use stored tempfile offsets.

Fix some error paths to not leak.
better error msg (bb#492)
limit logger msgs for node --info (bb#511)
fix typo
sxcp progress cosmetics

Prevent progress bar flashing when doing transfer retries or blocks are
skipped.
fix some error msgs
sxadm: set loglevel to warn for all commands

fix log_setminlevel to allow raising the severity, not just lowering it.
cosmetics
Introduce progress output for fast cluster to cluster transfer (bb#709)

Change sxi_cluster_query function to be a wrapper of
sxi_cluster_query_track. Now xfer_stat structure is passed to struct
generic_ctx context to enable progress tracking for normal generic
transfers too. This is done if track_xfer parameter is set to positive
though.

Update sxcp tool to fit both direction transfers.