reloc: rename package to align with arch convention

The `arch` in the package name is in a weird and not-common place. the
arch should be added as a suffix before the dot.

This commit align the package-name with the arch convention we use for
RPM and deb packages.

Issue scylladb/scylladb#9799

Author: benipeled

Diff for: reloc/build_reloc.sh

@@ -72,7 +72,7 @@ VERSION=$(./SCYLLA-VERSION-GEN ${VERSION_OVERRIDE:+ --version "$VERSION_OVERRIDE
 # the former command should generate build/SCYLLA-PRODUCT-FILE and some other version
 # related files
 PRODUCT=`cat build/SCYLLA-PRODUCT-FILE`
-DEST=build/$PRODUCT-python3-$(arch)-package.tar.gz
+DEST=build/$PRODUCT-python3-package-$(arch).tar.gz
 
 if [ "$CLEAN" = "yes" ]; then
     rm -rf build