Postpone creation of /var/lib/columnstore/local/module to post install

We're going to make ColumnStore relocatable (MCOL-4793). So a single ColumnStore installation should be able to run multiple instances with different configuration and data directories.

In order to make it easier, we should not:

• create the data directory */var/lib/columnstore/local/module
• install the file /var/lib/columnstore/local/module
  neither diring make install, nor during RPM or DEB installation.

A better options would be to create this file during a columnstore-post-install run.

We should also add a new command line argument to columnstore-post-install to specify the directory to install a new database to.

If the new argument is not passed, ENGINE_DATADIR could be used by default. Another option is to honor settings from ColumnStore.xml.