Fix breakages in OSS builds

See example breakages logs at:
http://ci.tensorflow.org/job/tensorflow-cl-cpu-python3-pip/10847/console
http://ci.tensorflow.org/job/tensorflow-cl-gpu/11008/console

1. CL/172477381 added the no_oss tag to tests with oss_serial tags, which broke the logic of OSS_SERIAL tests in pip.sh and run_pip_test.sh. This CL fixes that.

2. The nccl_kernels BUILD target in contrib/nccl/BUILD was missing some dependencies. This CL adds the missing ones.

Fixes: #13918
PiperOrigin-RevId: 173133914

tensorflow/contrib/nccl/BUILD

@@ -74,8 +74,10 @@ tf_kernel_library(
         "kernels/nccl_rewrite.cc",
     ],
     deps = [
+        "//tensorflow/core:core_cpu",
         "//tensorflow/core:framework",
         "//tensorflow/core:gpu_headers_lib",
+        "//tensorflow/core:lib",
         "//tensorflow/core:proto_text",
         "@nccl_archive//:nccl",
     ],

tensorflow/tools/ci_build/builds/run_pip_tests.sh

@@ -78,6 +78,7 @@ ln -s $(pwd)/tensorflow ${PIP_TEST_ROOT}/tensorflow
 # tests with no_pip_gpu tag.
 PIP_TEST_FILTER_TAG="-no_pip,-no_oss"
 if [[ ${IS_OSS_SERIAL} == "1" ]]; then
+  PIP_TEST_FILTER_TAG="$(echo "${PIP_TEST_FILTER_TAG}" | sed s/-no_oss//)"
   PIP_TEST_FILTER_TAG="${PIP_TEST_FILTER_TAG},oss_serial"
 else
   PIP_TEST_FILTER_TAG="${PIP_TEST_FILTER_TAG},-oss_serial"