Cleanup old mac address handling code to use JDK11 lib instead of hacks.
Also really strange to see some basic string parsing code was written by
hand, replaced with Long.parseValue(str, 16) to convert hex string to
long.

Signed-off-by: Rohit Yadav <[email protected]>

This introduces a MySQL innodb table based distributed lock which can
be used by one or more management server and its threads. This removes
usage of MySQL server provided locking functions (GET_LOCK,
RELEASE_LOCK) which are not replicated or supported currently by any
MySQL clustering solutions. This would be the first main step in having
CloudStack to work with a MySQL clustering solution such as InnoDB
cluster, Percona Xtradb cluster, MariaDB galera cluster. There may be
other changes required which can be found in due course if this feature
works at scale.

Signed-off-by: Rohit Yadav <[email protected]>