LU-1347 build: remove the vim/emacs modelines

LU-1347 build: remove the vim/emacs modelines

Remove the expandtabs directive from vim modelines from test scripts
and autoconf files as well.  In some cases where a very large test
script has been using 4-space indents for a long time, add directives
for 4-space tabstops so that the formatting is not too ugly.

Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I115abb1ceea5744495bc189bc5a83e734b845d36
Reviewed-on: http://review.whamcloud.com/2698
Tested-by: Hudson
Reviewed-by: Li Wei <liwei@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>