package_manager: fix opensuse detection

[ericLemanissier]

Changelog: Fix: Improve opensuse detection in tool.system.package_manager.
Docs: omit

For example, on opensuse tumbleweed, the distro name is opensuse-tumbleweed
this re-implements what was done in

conan/conans/client/tools/oss.py

Line 230 in f921551

if "opensuse" in self.linux_distro or "sles" in self.linux_distro:

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[ericLemanissier]

cf #3368

[czoido]

Hi @ericLemanissier,
Thanks for the contribution, I have to make some changes so that the code is coherent with the rest of distro -> package manager relation and also I'll add a test.

[czoido]

adding "opensuse-tumbleweed" as the distro related to zypper should solve the issue

[ericLemanissier]

#3368 mentions opensuse-leap, and I have no idea what are the names for sles. This is why I chose to keep the behaviour of conans/client/tools/oss.py

[czoido]

ok, I see, we can do some mix of both, and also test opensuse-leap and make sure that in the future if one distro returns opensuse-newversion it will not break...