i#1088: Add a -logdir option to the drdeploy frontends

This is needed for compatibility with the previous shell script.  It
simply forwards the option through to DR's runtime options.

This also cleans up all of the code trying to concatenate options with
spaces in between them.

Fixes issue 1088.

Review URL: https://codereview.appspot.com/7374050

git-svn-id: https://dynamorio.googlecode.com/svn/trunk@1940 49cc7528-f6fd-11dd-9d1a-b59b2e1864b6