specfile: fix logic for detecting if Python2 is supported

It's now less obfuscated. Python2 was conditionally enabled only if building for an old RHEL or old SLES but the version tests was not correct. Thanks to Matt Ezell from Oak Ridge. Fixes #445. Signed-off-by: Egbert Eich <eich@suse.com>

Author: e4t

clustershell.spec.in

@@ -21,7 +21,7 @@
 %{!?__python3: %global __python3 python3}
 %{!?python3_shortver: %global python3_shortver %(%{__python3} -c 'import sys; print(str(sys.version_info.major) + "." + str(sys.version_info.minor))')}
 
-%if ! 0%{?rhel} >= 8 && ! 0%{?suse_version} > 1550
+%if 0%{?rhel} < 8 && 0%{?suse_version} <= 1500
 %define py2 1
 %endif