add a maximum connection parameter and set the default to 1000

Conflicts:
	manifests/config.pp
	templates/my.cnf.erb
changed the test accordingly to the new max-connections parameter

Conflicts:
	spec/classes/mysql_config_spec.rb
changed the max_connections default to 151

this is the default according to the mysql manual.
https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_max_connections
Merge pull request #198 from mhellmic/maxconnections

add a maximum connection parameter and set the default to 1000