enhanced driver failover behaviour - it no longer depends
on operating system detection of connection loss
Merge branch 'master' of https://github.com/shesse/h2ha.git

Conflicts:
	h2ha-driver/src/main/java/com/shesse/jdbcproxy/AlternatingConnectionFactory.java
	h2ha-driver/src/main/java/com/shesse/jdbcproxy/HaConnection.java
	h2ha-driver/src/main/java/com/shesse/jdbcproxy/HaXaConnection.java