kunit: Fix TabError, remove defconfig code and handle when there is no kunitconfig

The identation before this code
(`if not os.path.exists(cli_args.build_dir):``)
was with spaces instead of tabs after fixed up merge conflits,
this commit revert spaces to tabs:

[iha@bbking linux]$ tools/testing/kunit/kunit.py run
  File "tools/testing/kunit/kunit.py", line 247
    if not linux:
                ^
TabError: inconsistent use of tabs and spaces in indentation

[iha@bbking linux]$ tools/testing/kunit/kunit.py run
Traceback (most recent call last):
  File "tools/testing/kunit/kunit.py", line 338, in <module>
    main(sys.argv[1:])
  File "tools/testing/kunit/kunit.py", line 215, in main
    add_config_opts(config_parser)

[iha@bbking linux]$ tools/testing/kunit/kunit.py run
Traceback (most recent call last):
  File "tools/testing/kunit/kunit.py", line 337, in <module>
    main(sys.argv[1:])
  File "tools/testing/kunit/kunit.py", line 255, in main
    result = run_tests(linux, request)
  File "tools/testing/kunit/kunit.py", line 133, in run_tests
    request.defconfig,
AttributeError: 'KunitRequest' object has no attribute 'defconfig'

Handles when there is no .kunitconfig, the error due to merge conflicts
between the following:

commit 9bdf64b3 ("kunit: use KUnit defconfig by default")
commit 45ba7a89 ("kunit: kunit_tool: Separate out
	config/build/exec/parse")

[iha@bbking linux]$ tools/testing/kunit/kunit.py run
Traceback (most recent call last):
  File "tools/testing/kunit/kunit.py", line 335, in <module>
    main(sys.argv[1:])
  File "tools/testing/kunit/kunit.py", line 246, in main
    linux = kunit_kernel.LinuxSourceTree()
  File "../tools/testing/kunit/kunit_kernel.py", line 109, in __init__
    self._kconfig.read_from_file(kunitconfig_path)
  File "t../ools/testing/kunit/kunit_config.py", line 88, in read_from_file
    with open(path, 'r') as f:
FileNotFoundError: [Errno 2] No such file or directory: '.kunit/.kunitconfig'
Signed-off-by: Vitor Massaru Iha <vitor@massaru.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/testing/kunit/kunit.py

@@ -23,7 +23,7 @@ import kunit_parser
 KunitResult = namedtuple('KunitResult', ['status','result','elapsed_time'])
 
 KunitConfigRequest = namedtuple('KunitConfigRequest',
-				['build_dir', 'defconfig', 'make_options'])
+				['build_dir', 'make_options'])
 KunitBuildRequest = namedtuple('KunitBuildRequest',
 			       ['jobs', 'build_dir', 'alltests',
 				'make_options'])
@@ -130,7 +130,6 @@ def run_tests(linux: kunit_kernel.LinuxSourceTree,
 	run_start = time.time()
 
 	config_request = KunitConfigRequest(request.build_dir,
-					    request.defconfig,
 					    request.make_options)
 	config_result = config_tests(linux, config_request)
 	if config_result.status != KunitStatus.SUCCESS:
@@ -212,7 +211,6 @@ def main(argv, linux=None):
 						help='Ensures that .config contains all of '
 						'the options in .kunitconfig')
 	add_common_opts(config_parser)
-	add_config_opts(config_parser)
 
 	build_parser = subparser.add_parser('build', help='Builds a kernel with KUnit tests')
 	add_common_opts(build_parser)
@@ -244,6 +242,9 @@ def main(argv, linux=None):
 			cli_args.build_dir,
 			kunit_kernel.kunitconfig_path)
 
+		if not os.path.exists(kunit_kernel.kunitconfig_path):
+			create_default_kunitconfig()
+
 		if not linux:
 			linux = kunit_kernel.LinuxSourceTree()
 
@@ -264,11 +265,13 @@ def main(argv, linux=None):
 				cli_args.build_dir,
 				kunit_kernel.kunitconfig_path)
 
+		if not os.path.exists(kunit_kernel.kunitconfig_path):
+			create_default_kunitconfig()
+
 		if not linux:
 			linux = kunit_kernel.LinuxSourceTree()
 
 		request = KunitConfigRequest(cli_args.build_dir,
-					     cli_args.defconfig,
 					     cli_args.make_options)
 		result = config_tests(linux, request)
 		kunit_parser.print_with_timestamp((
@@ -284,6 +287,9 @@ def main(argv, linux=None):
 				cli_args.build_dir,
 				kunit_kernel.kunitconfig_path)
 
+		if not os.path.exists(kunit_kernel.kunitconfig_path):
+			create_default_kunitconfig()
+
 		if not linux:
 			linux = kunit_kernel.LinuxSourceTree()
 
@@ -305,6 +311,9 @@ def main(argv, linux=None):
 				cli_args.build_dir,
 				kunit_kernel.kunitconfig_path)
 
+		if not os.path.exists(kunit_kernel.kunitconfig_path):
+			create_default_kunitconfig()
+
 		if not linux:
 			linux = kunit_kernel.LinuxSourceTree()