Fix DALI TF plugin source compilation during installation

- removes unnecessary escape characters from compilation commands
  for the DALI TF plugin stub and binary issues when the
  plugin is built from the source during installation. Before
  this change rpatch was incorrectly set to '$ORIGIN' instead
  of just $ORIGIN

Signed-off-by: Janusz Lisiecki <jlisiecki@nvidia.com>

dali_tf_plugin/dali_tf_plugin_install_tool.py

@@ -341,7 +341,7 @@ def build(self):
             dali_lflags = "-L" + tmpdir + " -ldali"
             dali_cflags = "-I" + os.path.join(self.src_path, "include")
 
-            cmd = [compiler, "-Wl,-R,'$ORIGIN/..'", "-std=c++14", "-DNDEBUG", "-shared"]
+            cmd = [compiler, "-Wl,-R,$ORIGIN/..", "-std=c++14", "-DNDEBUG", "-shared"]
             cmd += dali_stub_src.split()
             cmd += ["-o"]
             cmd += dali_stub_lib.split()
@@ -374,8 +374,8 @@ def build(self):
             root_include = "-I" + os.getenv("PREFIX", default="/usr") + "/include"
             cmd = [
                 compiler,
-                "-Wl,-R,'$ORIGIN/..'",
-                "-Wl,-rpath,'$ORIGIN'",
+                "-Wl,-R,$ORIGIN/..",
+                "-Wl,-rpath,$ORIGIN",
                 cpp_ver,
                 "-DNDEBUG",
                 "-shared",

qa/TL0_tensorflow_plugin/test.sh

@@ -25,6 +25,10 @@ test_body() {
     pip install ../../../nvidia-dali-tf-plugin*.tar.gz
     ${python_invoke_test} test_dali_tf_plugin.py:TestDaliTfPluginLoadOk
 
+    # Installing "current" dali tf (built against installed TF) - force rebuild
+    pip install ../../../nvidia-dali-tf-plugin*.tar.gz
+    DALI_TF_ALWAYS_BUILD=1 ${python_invoke_test} test_dali_tf_plugin.py:TestDaliTfPluginLoadOk
+
     # DALI TF run
     ${python_invoke_test} test_dali_tf_plugin_run.py