I thought you had already looked at the password in global.conf and confirmed that it changed. This doesn't seem to be the case now. After reading, there are a few other places you will need update the password. To avoid going through this, change the password back to refect what is currently in the global.conf file. The password is in global.conf three times(zodb-password, amqppassword, and zep-password).
# mysql -u root -p
Enter password:
mysql>SET PASSWORD FOR 'zenoss'@'localhost' = PASSWORD('put_the_password_here');
mysql>FLUSH PRIVILEGES;
mysql>exit
Then verify that it worked by trying to login to MySQL using the zenoss user.
# mysql -u zenoss -p
Enter password: (The password that you just changed back to what was already in the global.conf file)
mysql>exit