auc: sync with development branch

* update to new server API
 * include version_code in request
 * include versions of selected packages in request
 * add SHA256 verification via busybox sha256sum
 * sort attributes in policies alphabetically
 * move all API-specific string constants to precompiler macros
 * set correct MIME type for JSON post request (application/json)
 * output string error message if something goes wrong
 * auto-generate version string

(cherry squashed from commit 85ba80592b,
commit 985b0f8f63 and
commit fb26b424e8)
Signed-off-by: Daniel Golle <daniel@makrotopia.org>

utils/auc/Makefile

@@ -5,8 +5,8 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=auc
-PKG_VERSION:=0.1.4
+PKG_VERSION:=0.1.5
-PKG_RELEASE:=2
+PKG_RELEASE:=$(AUTORELEASE)
 PKG_LICENSE:=GPL-3.0
 
 include $(INCLUDE_DIR)/package.mk
@@ -17,18 +17,16 @@ define Package/auc
   CATEGORY:=Base system
   TITLE:=Attended sysUpgrade CLI (EXPERIMENTAL)
   DEPENDS:=+attendedsysupgrade-common +libblobmsg-json +libubox +libubus \
-           +libuci +libuclient +rpcd-mod-rpcsys +ucert
+           +libuci +libuclient +rpcd-mod-rpcsys
 endef
 
 define Package/auc/description
    CLI client for attended-sysupgrade
 endef
 
-# set to 1 to enable debugging
-DEBUG:=1
-
 EXTRA_CFLAGS += \
-	$(if $(DEBUG),-DAUC_DEBUG=ON)
+	-D'AUC_VERSION=\"$(PKG_VERSION)-$(PKG_RELEASE)\"' \
+	$(if $(CONFIG_DEBUG),-DAUC_DEBUG=ON)
 
 define Package/auc/install
 	$(INSTALL_DIR) $(1)/usr/sbin