convert bash to sh in scripts

- cannot rely on bash being installed on AIX
- the packaging scripts on solaris are already run under /bin/sh
  and there is no control over this (shebang is clearly ignored).
removing bashisms

used http://sourceforge.net/projects/checkbaskisms/
comment out berks
avoid running chef-solo entirely
solaris /bin/sh need backticks
/opt/freeware/bin in PATH for AIX
workaround for sol9 builds
fix comparison for sol9 broke /bin/sh
add warnings
FFS solaris is dumb
use same tmp location that install-test.bat does

- using a consistent location to install from ensures that
  install-test.bat can uninstall any msis that are left over