Adding the global ignore list for tests

Tests that compare output with an expected output strip text in
ignore files first.

This commit adds a global ignore-list intended to be used as a
fallback for all tests.

test/functional/README.md

@@ -468,6 +468,7 @@ Example:
 ```bash
 run <some_command>
 assert_files_not_equal foo/bar foo/baz
+```
 
 ### Ignore lists
 When using assertions that compare the command output to an expected output (for example

test/functional/ignore-list.global

@@ -0,0 +1,3 @@
+sh: .*/usr/bin/clr-boot-manager: No such file or directory
+sh: .*/usr/bin/clr-boot-manager: not found
+Update took .* seconds