Update tools/jmx/ submodule

* tools/jmx/ 57c16938...826da61d (4):
  > install.sh: do not create /usr/scylla/jmx in nonroot mode
  > install.sh: remove "echo done"
  > reloc-pkg: rename symlinks/scylla-jmx to select-java
  > install.sh: select java executable at runtime