Eliminate System.exit usage

[butvinm]

Try to reject usage of System.exit in codelines bellow

Programming/lab5/client/src/main/java/collection_manager/RemoteManager.java

Line 33 in 567532d

System.exit(1);

Programming/lab5/client/src/main/java/cli/ServerAdapter.java

Line 56 in 567532d

System.exit(1);

Programming/lab5/client/src/main/java/cli/commands/ExitCommand.java

Line 40 in 567532d

System.exit(0);