Add unit tests for graph/xml.cc & graph/xml.h (#1833)

* Added new binary for executing unit tests

Added new unit tests for argcheck.cc and alt_rsmi.cc files

Modified the method to execute unit tests to cover static methods
by using a bash script to convert static to non-static functions
and variables on the fly restricted to debug build type.

* Added new unit tests for src/transport/shm.cc

* Added new unit tests for graph/xml.cc

Author: atulkulk

test/CMakeLists.txt

@@ -149,6 +149,7 @@ if(BUILD_TESTS)
       TransportTests.cpp
       common/main_fixtures.cpp
       common/EnvVars.cpp
+      graph/XmlTests.cpp
     )
 
     add_executable(rccl-UnitTestsFixtures ${TEST_FIXTURE_SOURCE_FILES})