Implement native/base process checks for FreeBSD

  - Make rsync process checks OS-dependent
  - Use (BSD) netstat on FreeBSD (not lsof)

scripts/wsrep_sst_rsync.sh

@@ -63,6 +63,14 @@ check_pid_and_port()
     local rsync_addr=$3
     local rsync_port=$4
 
+    case $OS in
+    FreeBSD)
+        local port_info=$(netstat -46lp ${rsync_port} 2>/dev/null | \
+        grep ":${rsync_port}")
+        local is_rsync=$(echo $port_info | \
+        grep -w '[[:space:]]\+rsync[[:space:]]\+'"$rsync_pid" 2>/dev/null)
+        ;;
+    *) 
         if ! which lsof > /dev/null; then
           wsrep_log_error "lsof tool not found in PATH! Make sure you have it installed."
           exit 2 # ENOENT
@@ -76,6 +84,8 @@ check_pid_and_port()
             grep "$rsync_addr:$rsync_port" 2>/dev/null)
         local is_rsync=$(echo $port_info | \
             grep -w '^rsync[[:space:]]\+'"$rsync_pid" 2>/dev/null)
+        ;;
+    esac
 
     if [ ! -z "$is_listening_all" -o ! -z "$is_listening_addr" ]; then
         if [ -z "$is_rsync" ]; then