Package alterator-module-executor: Information

- Add the ability to add environment variables from the alterator-manager
  database.
- Add memory freeing for the structure with data for launching processes in case
  of a process startup error and in case of a command line parsing error.
- Add reduction of thread counters in case of command line parsing error and in
  case of process startup error.

- Add validation of interfaces by template.

- Add the ability to work in user mode (systemctl --user).
- Add the ability to output data from stdout and stderr when condition is
  G_IO_HUP. Continues to read from channel until error or EOF.