criu --help: don't use argv[0], print help in one call
criu --help: don't use argv[0], print help in one call

This patch

1. Replaces using argv[0] with criu literal. Using argv[0] is bad
because it can be a relative path, and it can be not "criu" but
say a symlink pointing to criu.

2. Reformats the source to print basic help test in justone call to
pr_msg(), same as commit 6ea0e00 did for extended help, for same
reasons: having it this way is easier to do further edits.

Signed-off-by: Kir Kolyshkin <c0159612b0ef32139322233232df1a0d189c4b9b@openvz.org>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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