Allow version parsing for mariadb 11 and above

[zyclonite]

Motivation:

Since using mariadb version 11.0.2 i always get parsing exceptions copied below
This commit keeps the old parsing intact but falls back to a method similar to mysql if the mariadb version does not have the 5.5.5- prefix

WARN  i.v.m.i.MySQLDatabaseMetadata [vert.x-eventloop-thread-3] - Incorrect parsing server version tokens
java.lang.NumberFormatException: For input string: ""
	at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:67)
	at java.base/java.lang.Integer.parseInt(Integer.java:675)
	at java.base/java.lang.Integer.parseInt(Integer.java:781)
	at io.vertx.mysqlclient.impl.MySQLDatabaseMetadata.parse(MySQLDatabaseMetadata.java:57)
	at io.vertx.mysqlclient.impl.codec.InitialHandshakeCommandCodec.handleInitialHandshake(InitialHandshakeCommandCodec.java:74)
	at io.vertx.mysqlclient.impl.codec.InitialHandshakeCommandCodec.decodePayload(InitialHandshakeCommandCodec.java:59)
	at io.vertx.mysqlclient.impl.codec.MySQLDecoder.decodePackets(MySQLDecoder.java:72)
	at io.vertx.mysqlclient.impl.codec.MySQLDecoder.channelRead(MySQLDecoder.java:48)
	at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:251)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
	at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:346)
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:318)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:440)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:788)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562)
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.base/java.lang.Thread.run(Thread.java:1623)

[BillyYccc]

can you also make a PR to backport this feature to 4.x branch?

[zyclonite]

sure, see referenced pr

[BillyYccc]

Thanks for the contribution!