The following issues were fixed:
* comparison too broad (e.g. "0" misinterpreted as "true")
* python: comparing string with number (is never equal in python)
* unwanted non-zero exitcode (compound command "&&" as last command in
shell code block (e.g. "case" or "if" branch))
* access to unset variable (shell style issue)
- Merge io_* plugins into one multigraph plugin
- Change graph appearance like linux diskstats plugin
RRD files generated by io_busy_, io_ios_, io_bytes_ can be taken over
- Add queue and latency functions
- Remove perl code and replace old Solaris::MapDev feature by
using iostat
- Add POD style document
- Refactoring, using functions, replace variable names, check with
shellcheck
