Since we support more versions of the daemon running with the same socket file,
we can't blindly remove the socket file. MariaDB doesn't do it, so let's don't
do it here as well.

RHBZ#1045401

diff -up mysql-5.5.36/scripts/mysqld_safe.sh.socket-removal mysql-5.5.36/scripts/mysqld_safe.sh
--- mysql-5.5.36/scripts/mysqld_safe.sh.socket-removal	2014-02-12 20:53:35.655312819 +0100
+++ mysql-5.5.36/scripts/mysqld_safe.sh	2014-02-12 20:53:45.014310456 +0100
@@ -779,7 +779,7 @@ have_sleep=1
 
 while true
 do
-  rm -f $safe_mysql_unix_port "$pid_file"	# Some extra safety
+  rm -f "$pid_file"	# Some extra safety
 
   start_time=`date +%M%S`