static void addInitialHeap(final List<String> commandLine, final String initialHeap) {
    if (StringUtils.isNotBlank(initialHeap)) {
      commandLine.add("-Xms" + initialHeap);
    }
  }
Encapsulates methods used by StartServerCommand and StartLocatorCommand and their associated
tests.

@see StartLocatorCommand
@see StartServerCommand
geode-gfsh/src/main/java/org/apache/geode/management/internal/cli/commands/StartMemberUtils.java