java_keystore: fix keystore type (#2516) (#2893)

* fix keystore type; update unit tests

* add changelog fragment

* document new param 'keystore_type'

* add keystore_type support (backward compatible)

* check JKS format with magic bytes
* update integration tests
* revert first changes in unit tests
* update changelog fragment

* fix magic bytes for python2/python3

* fix integration tests (irrelevant check_mode)

* fix unit test (keystore removed before failure => changed=true)

* fix typo

* fix spelling

* shorten a branch

* mock is_jks_or_pkcs12

* fix function path in unit tests

* Apply suggestions from code review (spelling)

Co-authored-by: Ajpantuso <ajpantuso@gmail.com>

* rename a method (module + unit tests)

* move ArgumentSpec class content to main()

* refactor create() to not loose existing keystore in case of error

* update unit tests

* add integration test (error handling)

* fix keystore backup cleanup

Co-authored-by: Ajpantuso <ajpantuso@gmail.com>
(cherry picked from commit 199ead85d0)

Co-authored-by: quidame <quidame@poivron.org>

changelogs/fragments/2516_fix_2515_keystore_type_jks.yml

@@ -0,0 +1,4 @@
+---
+bugfixes:
+  - "java_keystore - add parameter ``keystore_type`` to control output file format and override ``keytool``'s
+    default, which depends on Java version (https://github.com/ansible-collections/community.general/issues/2515)."