Replace sle_version with suse_version in openQA spec file

As per
https://en.opensuse.org/openSUSE:Packaging_for_Leap#RPM_Distro_Version_Macros
this commit substitutes sle_version to suse_version macro because the
sle_version does not exist in versions with code 16 like Leap
16.0. `suse_version` seems to provide backwards compatibility with Code 15 so
it is as simple as that. Alternative it would have to check whether
sle_version is not defined and adjust the conditions.

https://progress.opensuse.org/issues/182228

Author: b10n1k

dist/rpm/openQA.spec

@@ -27,7 +27,7 @@
 %{nil}
 %endif
 # Run tests on openSUSE Tumbleweed and supported openSUSE Leap versions
-%if 0%{?suse_version} >= 1550 || ( 0%{?is_opensuse} && 0%{?sle_version} >= 150100 )
+%if 0%{?suse_version} >= 1550 || ( 0%{?is_opensuse} && 0%{?suse_version} >= 1500 )
 %ifarch x86_64
 %bcond_without tests
 %else
@@ -37,13 +37,13 @@
 %bcond_with tests
 %endif
 # SLE < 15 does not provide many of the dependencies for the python sub-package
-%if 0%{?sle_version} < 150000 && !0%{?is_opensuse}
+%if 0%{?suse_version} < 1500 && !0%{?is_opensuse}
 %bcond_with python_scripts
 %else
 %bcond_without python_scripts
 %endif
 # exclude additional sub packages that would pull in a lot of extra dependencies on SLE
-%if 0%{?sle_version} && !0%{?is_opensuse}
+%if 0%{?suse_version} && !0%{?is_opensuse}
 %bcond_with devel_package
 %bcond_with munin_package
 %else
@@ -104,7 +104,7 @@ BuildRequires:  fdupes
 %if 0%{?is_opensuse}
 BuildRequires:  openSUSE-release
 %endif
-%if 0%{?sle_version} && !0%{?is_opensuse}
+%if 0%{?suse_version} && !0%{?is_opensuse}
 BuildRequires:  sles-release
 %endif
 BuildRequires:  %{build_requires}