fix copying the mysql logs on completion

after telling jay that we were creating and archiving mysql slow
logs on every run, I was found to be a liar. This turns out to be
because we did shell expansion at the wrong point and got the
following in cleanup:

+ sudo cp '/var/log/mysql/*' ....-devstack-vm-full/logs/mysql/
cp: cannot stat `/var/log/mysql/*': No such file or directory

Do a cp -a instead to not fail on shell expansion

Change-Id: Ifd20ba17f7ff7d528697fbadd9f1d0178e7e7767

devstack-vm-gate-wrap.sh

@@ -277,8 +277,7 @@ function cleanup_host {
     mkdir $WORKSPACE/logs/rabbitmq/
     sudo cp /var/log/rabbitmq/* $WORKSPACE/logs/rabbitmq/
     if [ -d /var/log/mysql ] ; then
-        mkdir $WORKSPACE/logs/mysql/
-        sudo cp /var/log/mysql/* $WORKSPACE/logs/mysql/
+        sudo cp -a /var/log/mysql $WORKSPACE/logs/
     fi
     mkdir $WORKSPACE/logs/sudoers.d/
 
@@ -311,6 +310,10 @@ function cleanup_host {
     rename 's/\.log$/.txt/' $WORKSPACE/logs/*
     rename 's/(.*)/$1.txt/' $WORKSPACE/logs/sudoers.d/*
     rename 's/\.log$/.txt/' $WORKSPACE/logs/rabbitmq/*
+    if [ -d $WORKSPACE/logs/mysql ]; then
+        rename 's/\.log$/.txt/' $WORKSPACE/logs/mysql/*
+    fi
+
     mv $WORKSPACE/logs/rabbitmq/startup_log \
        $WORKSPACE/logs/rabbitmq/startup_log.txt