split minijail0 cli parsers into a sep module

This will let us unittest them easily.  The only thing this CL has done
is move all the non-main funcs from minijail0.c to minijail0_cli.c.

Bug: None
Test: `make check` passes
Change-Id: I2be5cf2097d1f8d15270595f5200c872a0a551c4
diff --git a/Makefile b/Makefile
index 7bbb0b4..cc57224 100644
--- a/Makefile
+++ b/Makefile
@@ -60,7 +60,8 @@
 
 
 CC_BINARY(minijail0): LDLIBS += -lcap -ldl
-CC_BINARY(minijail0): $(CORE_OBJECT_FILES) elfparse.o minijail0.o
+CC_BINARY(minijail0): $(CORE_OBJECT_FILES) \
+	elfparse.o minijail0.o minijail0_cli.o
 clean: CLEAN(minijail0)