Infer rootwrap arguments from project

We can infer the binary and configuration paths just from the project
name and expanding this to the known *_DIR & *_BIN_DIR variables.  A
similar thing is done for policyd settings

Change-Id: I7c6a9fa106948ae5cbcf52555ade6154623798f1
diff --git a/inc/rootwrap b/inc/rootwrap
index bac8e1e..411e5f7 100644
--- a/inc/rootwrap
+++ b/inc/rootwrap
@@ -38,11 +38,17 @@
 
 # Configure rootwrap
 # Make a load of assumptions otherwise we'll have 6 arguments
-# configure_rootwrap project bin conf-src-dir
+# configure_rootwrap project
 function configure_rootwrap {
-    local project=$1                    # xx
-    local rootwrap_bin=$2               # /opt/stack/xx.venv/bin/xx-rootwrap
-    local rootwrap_conf_src_dir=$3      # /opt/stack/xx/etc/xx
+    local project=$1
+    local project_uc=$(echo $1|tr a-z A-Z)
+    local bin_dir="${project_uc}_BIN_DIR"
+    bin_dir="${!bin_dir}"
+    local project_dir="${project_uc}_DIR"
+    project_dir="${!project_dir}"
+
+    local rootwrap_conf_src_dir="${project_dir}/etc/${project}"
+    local rootwrap_bin="${bin_dir}/${project}-rootwrap"
 
     # Start fresh with rootwrap filters
     sudo rm -rf /etc/${project}/rootwrap.d