Update to support OEMCrypto v16 with ODK

oem_certificate_generator/BUILD

@@ -7,27 +7,42 @@
 ################################################################################
 
 # Build file for OEM certificate generation tool.
-
 package(default_visibility = ["//visibility:public"])
 
+
 py_binary(
     name = "oem_certificate",
     srcs = ["oem_certificate.py"],
+    python_version = "PY3",
+    srcs_version = "PY3",
+    deps = [
+        ":oem_certificate_main_lib",
+    ],
+)
+
+py_library(
+    name = "oem_certificate_main_lib",
+    srcs = ["oem_certificate.py"],
+    srcs_version = "PY3",
+    deps = [
+    ],
 )
 
 py_library(
     name = "oem_certificate_test_helper",
     srcs = ["oem_certificate_test_helper.py"],
+    srcs_version = "PY3",
     deps = [
-        ":oem_certificate",
     ],
 )
 
 py_test(
     name = "oem_certificate_test",
     srcs = ["oem_certificate_test.py"],
+    python_version = "PY3",
+    srcs_version = "PY3",
     deps = [
-        ":oem_certificate",
+        ":oem_certificate_main_lib",
         ":oem_certificate_test_helper",
     ],
 )