[WIP][apricot] A Processor and Repository for Configuration Templates

This looks to create apricot as a standalone binary.
Its primary interface is protos/apricot.proto, and it serves as a shim
daemon (apricot/server.go) for configuration.Service, the non-remote
implementation of the apricot.Service interface.

A remote interface will be apricot/client.go, and this too should
implement apricot.Service.

Most code should be further refactored so that using the interface makes
all calls indistinguishable whether the call is compiled-in, or a gRPC
call implemented in apricot.Client.

coconut should then be cleaned up and Consul KV access code should be
deduplicated. In the end, consul conf should mostly remain as a thin
wrapper around apricot.Client.

Makefile

@@ -53,8 +53,8 @@ WHAT_walnut_BUILD_FLAGS=$(BUILD_ENV_FLAGS)
 INSTALL_WHAT:=$(patsubst %, install_%, $(WHAT))
 
 
-GENERATE_DIRS := ./core ./executor ./coconut/cmd ./odcshim ./walnut
-SRC_DIRS := ./cmd/* ./core ./coconut ./executor ./common ./configuration ./occ/peanut ./odcshim ./walnut
+GENERATE_DIRS := ./apricot ./core ./executor ./coconut/cmd ./odcshim ./walnut
+SRC_DIRS := ./apricot ./cmd/* ./core ./coconut ./executor ./common ./configuration ./occ/peanut ./odcshim ./walnut
 
 # Use linker flags to provide version/build settings to the target
 PROD :=-X=$(REPOPATH)/common/product

apricot/client.go

@@ -0,0 +1 @@
+package apricot