move cleanup of pyc files

Previously pyc files were only cleaned if clean.sh was run.
with this change a new clean_pyc_files function was introduced
with the logic that was previously in clean.sh but it is now
invoked from unstack.sh

With the previous behavior you could not stack with horizon
enabled then unstack and stack again due to the presence of pyc
files that were owned by root.

By moving the clean to unstack in stead of clean.sh you can
now stack, unstack and stack again without hitting the pyc issue.
since unstack is invoked by clean the existing clean.sh behavior has
not changed in practice except for the fact the pyc files are
removed sooner in the process.

This change also removes support for findutils < 4.2.3
Ubuntu 12.04 and CentOS 6 both have 4.4.2 since they were
released 8 years ago and are now EOL its fair to assume
that all modern distros have 4.2.3+
https://repology.org/project/findutils/versions

Change-Id: I13c9aad9be7e0930a0d875b7d382090caf0b8982

clean.sh

@@ -145,12 +145,3 @@ done
 
 rm -rf ~/.config/openstack
 
-# Clean up all *.pyc files
-if [[ -n "$DEST" ]] && [[ -d "$DEST" ]]; then
-    find_version=`find --version | awk '{ print $NF; exit}'`
-    if vercmp "$find_version" "<" "4.2.3" ; then
-        sudo find $DEST -name "*.pyc" -print0 | xargs -0 rm
-    else
-        sudo find $DEST -name "*.pyc" -delete
-    fi
-fi

functions-common

@@ -2415,6 +2415,13 @@ function time_totals {
     $xtrace
 }
 
+function clean_pyc_files {
+    # Clean up all *.pyc files
+    if [[ -n "$DEST" ]] && [[ -d "$DEST" ]]; then
+        sudo find $DEST -name "*.pyc" -delete
+    fi
+}
+
 # Restore xtrace
 $_XTRACE_FUNCTIONS_COMMON
 

unstack.sh

@@ -182,3 +182,5 @@ if is_service_enabled cinder && is_package_installed lvm2; then
     clean_lvm_volume_group $DEFAULT_VOLUME_GROUP_NAME || /bin/true
     clean_lvm_filter
 fi
+
+clean_pyc_files