Support cgroup v2 locations when reading CPU share and memory limit

[matmannion]

If the docker daemon is running on a host that supports control group v2, run-java.sh does not correctly calculate CPU share or memory limits because it only looks in the v1 location. This fixes this by looking in the correct locations for control group v2.

For example, with current master:

$ docker run -e JAVA_MAX_MEM_RATIO=80 --memory=2g --cpu-quota 1000000 -it openjdk:8 /bin/bash
root@edec19b1d93e:/# curl -s https://raw.githubusercontent.com/fabric8io-images/run-java-sh/master/fish-pepper/run-java-sh/fp-files/run-java.sh -o /usr/local/bin/run-java.sh
root@edec19b1d93e:/# chmod +x /usr/local/bin/run-java.sh
root@edec19b1d93e:/# run-java.sh options
-XX:+UseParallelGC -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90 -XX:MinHeapFreeRatio=20 -XX:MaxHeapFreeRatio=40 -XX:+ExitOnOutOfMemoryError

vs with this change:

$ docker run -e JAVA_MAX_MEM_RATIO=80 --memory=2g --cpu-quota 1000000 -it openjdk:8 /bin/bash
root@39eca3625501:/# curl -s https://raw.githubusercontent.com/matmannion/run-java-sh/bugfix/cgroupv2/fish-pepper/run-java-sh/fp-files/run-java.sh -o /usr/local/bin/run-java.sh
root@39eca3625501:/# chmod +x /usr/local/bin/run-java.sh 
root@39eca3625501:/# run-java.sh options
-Xmx1638m -XX:ParallelGCThreads=10 -XX:ConcGCThreads=10 -Djava.util.concurrent.ForkJoinPool.common.parallelism=10 -XX:CICompilerCount=4 -XX:+UseParallelGC -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90 -XX:MinHeapFreeRatio=20 -XX:MaxHeapFreeRatio=40 -XX:+ExitOnOutOfMemoryError