revamp of cmake in katran to support oss build with fbcode_builder

Summary: changes the way it pulls its dependencies

Reviewed By: wez

Differential Revision: D17363235

fbshipit-source-id: 37e509c7e413f763e3553e9f01ac23951045089c

build/fbcode_builder/manifests/katran

@@ -12,7 +12,7 @@ builder = nop
 
 [build.os=linux]
 builder = cmake
-subdir = katran
+subdir = .
 
 [cmake.defines]
 BUILD_TESTS = OFF