lib/srdb1: update rule to generate mongodb json spec file for db tables

- do not generate docbook files by default

(cherry picked from commit 013ed5ae2a72dfe10159ef4e9cf66ea9eabf07a7)

src/lib/srdb1/schema/Makefile

@@ -69,7 +69,7 @@ ifeq ($(VERBOSE), 1)
 	override XSLTPROC := $(XSLTPROC) --verbose
 endif
 
-all: mysql postgres dbtext db_berkeley db_sqlite docbook oracle pi_framework #modules dbdoc
+all: mysql postgres dbtext db_berkeley db_sqlite oracle mongodb pi_framework
 
 .PHONY: pi_framework pi_framework_clean
 pi_framework: