Werk #7013: mk_mysql: Fixed detecting wrong MySQL instances

On systems with mysqld running together with php-cgi using specific options on the command line (like it is done by Check_MK sites), it could happen that the mk_mysql agent plugin detects not existing MySQL instances which leads to UNKNOWN services in Check_MK.

Processes that lead to wrong discovered services look like this:

root 901 1 0 Dec10 ? 00:00:00 /bin/sh /usr/bin/mysqld_safe mysql 1274 901 0 Dec10 ? 01:27:32 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --log-error=/var/log/mysql/error.log --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock --port=3306 wiki 16937 32282 0 13:21 ? 00:00:00 /usr/bin/php5-cgi -d session.save_handler=files -d session.save_path=/omd/sites/wiki/tmp/php/session -d upload_tmp_dir=/omd/sites/wiki/tmp/php/upload -d soap.wsdl_cache_dir=/omd/sites/wiki/tmp/php/wsdl-cache -d safe_mode=Off -d mysql.default_socket=/omd/sites/wiki/tmp/run/mysqld/mysqld.sock intern 27074 32276 0 10:39 ? 00:00:00 /usr/bin/php5-cgi -d session.save_handler=files -d session.save_path=/omd/sites/intern/tmp/php/session -d upload_tmp_dir=/omd/sites/intern/tmp/php/upload -d soap.wsdl_cache_dir=/omd/sites/intern/tmp/php/wsdl-cache -d safe_mode=Off -d mysql.default_socket=/omd/sites/intern/tmp/run/mysqld/mysqld.sock wiki 29129 32282 0 10:46 ? 00:00:02 /usr/bin/php5-cgi -d session.save_handler=files -d session.save_path=/omd/sites/wiki/tmp/php/session -d upload_tmp_dir=/omd/sites/wiki/tmp/php/upload -d soap.wsdl_cache_dir=/omd/sites/wiki/tmp/php/wsdl-cache -d safe_mode=Off -d mysql.default_socket=/omd/sites/wiki/tmp/run/mysqld/mysqld.sock root 29561 26105 0 16:51 pts/0 00:00:00 grep mysqld wiki 30673 32282 0 09:00 ? 00:00:03 /usr/bin/php5-cgi -d session.save_handler=files -d session.save_path=/omd/sites/wiki/tmp/php/session -d upload_tmp_dir=/omd/sites/wiki/tmp/php/upload -d soap.wsdl_cache_dir=/omd/sites/wiki/tmp/php/wsdl-cache -d safe_mode=Off -d mysql.default_socket=/omd/sites/wiki/tmp/run/mysqld/mysqld.sock

Only the process 1274 should be detected as MySQL instance.

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