closes odoo/odoo#34901

Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>

Add the support to be able to specify exlicitely module, class and method name in test_tags

Before this commit, there is no distinction between module tag and test tag. Meaning
that --test-tag module_name will replace the default +standard tag and execute all test
of the module.

This commit tries to keep the initial behaviour, while addind new features, like explicit
modules tag with /module_name, as well as class (:class) and method (.method)

Some usage examples:
--test_tags /module will execute all standard test of module
--test_tags :class will execute all standard test with class name 'class'
--test_tags .method will execute all standard test with method name 'method'
--test_tags external/module will execute all external test of module
--test_tags */module will execute all tests of module,
--test_tags */module,-standard will execute all non standard tests of module,
--test_tags -/website:TestUiTranslate.test_admin_tour_rte_translator will disable only rte translator test

closes odoo/odoo#34756

Signed-off-by: Raphael Collet (rco) <rco@openerp.com>

This commit replaces calls to pycompat helpers that were intended for
python 2 <-> python 3 interoperability for python 3 builtins, as python
2 is no longer officially supported by Odoo.

This includes:
    * calls to imap/izip/ifilter replaced by map/zip/filter
    * uses of text_type replaced by str
    * uses of unichr replaced by chr
    * calls to implements_to_string, implements_iterator removed
    * string_types and integer_types replaced by str, int respectively
    * calls to to_native replaced by calls to to_text

This is done in preparation to the removal of these deprecated helpers
in the following commit.

Purpose: When running tests, all the tests for the installed/updated
files are done. This commit adds a 'tagged' decorator that can be used to
tag tests. Combined with a new 'test-tags' CLI option, it adds the ability
to filter which tests are executed. For example, @tagged('slow') will
add a tag 'slow' to the test. The CLI option 'test-tags="slow"' will
only run tests tagged 'slow'.

One can use prefixes to select cases with tags.
'+' or no prefix means that the tests tagged with this tag are selected
for execution. '-' prefix will exclude the tests tagged with this tag.
Exclusion takes precedence over inclusion.

Also, by default, all Odoo tests cases are tagged 'standard' and with
the technical name of the module.
This means that when selecting tests with the 'test-tags'
parameter, if '-standard' is not specified, all tests tags are
going to be executed.
When tagging tests, one can remove such automatic tag by prefixing the
tag name with '-'. E.g. @tagged('-standard') will remove the standard
tag from the test.

Another example, if one wants to test the 'sale' module alone,
even without adding any 'tagged' decorator thos tests can be selected
like that: --test-tags="sale"

Tests are selected or deselected using a TagsSelector. When instanciated,
 a string is passed with comma separated tests selectors like
'+slow,-standard'. When the 'check' method is called  with a test as argument,
it returns True or False if the test has to be executed or not.

* remove references to basestring & unicode (use relevant pycompat
  helpers)
* remove some str calls (either entirely or replaced by relevant
  helper, either text or native)
* use better API to avoid unnecessary conversions
* remove some XML declarations in views