Add virtual workbook / config-in-skeleton classes

This patch introduces a new abstraction 'skeleton-workbook'
for representing a system configuration.  At present it is
pulled in by the skeleton recipe so the requirement on what is
implemented by a package providing obmc-phosphor-workbook is something
compatible with the existing System.py python modules in skeleton.

Additionally this patch adds a new recipe for each system using
a configuration file from skeleton today, and a class for common
configuration.

This enables a couple of things:
 - No need to patch skeleton.service for each system.
 - New systems don't have to put their configuration in the skeleton
     repository.

Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-palmetto/recipes-phosphor/workbook/palmetto-config.bb b/meta-palmetto/recipes-phosphor/workbook/palmetto-config.bb
new file mode 100644
index 0000000..730ba1a
--- /dev/null
+++ b/meta-palmetto/recipes-phosphor/workbook/palmetto-config.bb
@@ -0,0 +1,8 @@
+SUMMARY = "Palmetto board wiring"
+DESCRIPTION = "Board wiring information for the Palmetto system."
+HOMEPAGE = "http://github.com/openbmc/skeleton"
+PR = "r1"
+
+SRCREV = "5213a991a5a3bd107636f1b2cc3bbca560843462"
+inherit config-in-skeleton
+inherit obmc-phosphor-license