pre-process desired LRPs to replace placeholders

also, stop building start messages; deal with desired LRPs directly, which are
now made generic

Signed-off-by: Ted Young <tyoung@pivotallabs.com>
deps

Signed-off-by: Ted Young <tyoung@pivotallabs.com>
remove all circus knowledge

Signed-off-by: Ted Young <tyoung@pivotallabs.com>
fix file server placeholder replacing

Signed-off-by: Simon Leung <leungs@us.ibm.com>
remove repaddrrelativetoexecutor

Signed-off-by: Simon Leung <leungs@us.ibm.com>
preprocess environment variables

Signed-off-by: Simon Leung <leungs@us.ibm.com>