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A few fixes in scripts that were found when debugging #3508.
This series fixed this issue.
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Fixes#3508
* 'ami_scripts_fixes-v1' of https://github.com/vladzcloudius/scylla:
scylla_io_setup: properly define the disk_properties YAML hierarchy
scylla_io_setup: fix a typo: s/write_bandwdith/write_bandwidth/
scylla_io_setup: hardcode the "mountpoint" YAML node to "/var/lib/scylla" for AMIs
scylla_io_setup: print the io_properties.yaml file name and not its handle info
scylla_lib.sh: tolerate perftune.py errors