Corner case in parsing major version of JDK

[Eskibear]

The logic is to parse the string after "version", but for someone with AdoptOpenJDK 11.0.x, output of java -version was just as below:

openjdk 11.0.6 2020-01-14
OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.6+10)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.6+10, mixed mode)

There's no "version" between "openjdk" and "11.0.6", and the major version would be recognized as 0.

Originally reported by microsoft/vscode-java-pack#309 (comment)

[Eskibear]

According to adoptium/temurin-build#1610 (comment) , it should always have "version" there. It's not clear what was happening on the user's machine. I don't think further actions need to be taken now, let's keep an eye on it.

[fbricon]

Closed with #1635