[unit test] versionwatch should run against latest builds, not hardcoded older Betas

versionwatch should run against latest builds, not hardcoded older Betas.

Need a way to pull the latest builds from /staging/ so that instead of testing hardcoded Beta2 builds we use the latest.

This might have broken as a result of a bug in install.jbds.sh - I thought this used to work:

++ TMPDIR=/tmp
/mnt/hudson_workspace/workspace/devstudio.versionwatch_8.0.luna/sources/vwatch/install.jbds.sh: command substitution: line 151: unexpected EOF while looking for matching `"'
/mnt/hudson_workspace/workspace/devstudio.versionwatch_8.0.luna/sources/vwatch/install.jbds.sh: command substitution: line 152: syntax error: unexpected end of file

Either way, we need a better unit test here to ensure that the versions diffed are NOT just the list of hardcoded ones, but instead include the hardcoded list + at least one more (latest build).