target: tests: Address review comments on PR#667

PR#667: https://github.com/ARM-software/devlib/pull/667

- Implement a test module initializer with a tear down method in
  test/test_target.py
- Make various cleanups in test/test_target.py
- Improve structure of test/test_config.yml (previously
  target_configs.yaml)
- Make docstrings Sphinx compatible
- Make ``TargetRunner`` and its subclasses private
- Cleanup tests/test_target.py
- Replace print()'s with appropriate logging calls
- Implement ``NOPTargetRunner`` class for simplifying tests
- Improve Python v3.7 compatibility
- Relax host machine type checking
- Escape user input strings

and more..

Signed-off-by: Metin Kaya <metin.kaya@arm.com>

tools/docker/target_configs.yaml

@@ -1,43 +0,0 @@
-AndroidTarget:
-  # Android-12, Pixel-6
-  entry-0:
-    timeout: 60
-    connection_settings:
-      device: 'emulator-5554'
-
-  # Android-14, Pixel-6
-  entry-1:
-    connection_settings:
-      device: 'emulator-5556'
-
-  # Android-13, Pixel tablet
-  entry-2:
-    connection_settings:
-      device: 'emulator-5558'
-
-LocalLinuxTarget:
-  entry-0:
-    connection_settings:
-      unrooted: True
-
-QEMUTargetRunner:
-  entry-0:
-    qemu_settings:
-      kernel_image: '/devlib/tools/buildroot/buildroot-v2023.11.1-aarch64/output/images/Image'
-
-    ChromeOsTarget:
-      connection_settings:
-        device: 'emulator-5558'
-
-  entry-1:
-    connection_settings:
-      port: 8023
-
-    qemu_settings:
-      kernel_image: '/devlib/tools/buildroot/buildroot-v2023.11.1-x86_64/output/images/bzImage'
-      arch: 'x86_64'
-      cmdline: 'console=ttyS0'
-
-    ChromeOsTarget:
-      connection_settings:
-        device: 'emulator-5558'

tools/docker/target_configs.yml

@@ -0,0 +1,46 @@
+target-configs:
+  entry-0:
+    # Android-12, Pixel-6
+    AndroidTarget:
+      timeout: 60
+      connection_settings:
+        device: 'emulator-5554'
+
+  entry-1:
+    # Android-14, Pixel-6
+    AndroidTarget:
+      connection_settings:
+        device: 'emulator-5556'
+
+  entry-2:
+    # Android-13, Pixel tablet
+    AndroidTarget:
+      connection_settings:
+        device: 'emulator-5558'
+
+  entry-3:
+    LocalLinuxTarget:
+      connection_settings:
+        unrooted: True
+
+  entry-4:
+    # aarch64 target
+    QEMUTargetRunner:
+      qemu_settings:
+        kernel_image: '/devlib/tools/buildroot/buildroot-v2023.11.1-aarch64/output/images/Image'
+      ChromeOsTarget:
+        connection_settings:
+          device: 'emulator-5558'
+
+  entry-5:
+    # x86_64 target
+    QEMUTargetRunner:
+      connection_settings:
+        port: 8023
+      qemu_settings:
+        kernel_image: '/devlib/tools/buildroot/buildroot-v2023.11.1-x86_64/output/images/bzImage'
+        arch: 'x86_64'
+        cmdline: 'console=ttyS0'
+      ChromeOsTarget:
+        connection_settings:
+          device: 'emulator-5558'