create pid file immediately after fork again
Related to https://fedorahosted.org/sssd/ticket/1357
We realized that sysv and systemd does not use pid file existence
as a notification of finished initialization. Therefore, we create
the pid file in server_setup() again.
We are removing check_file() from monitor main(), it is handled
by server_setup() during pid file creation. This check was
previously included in e7dd2a5102ba6cfd28be6eccdd62768e9758d9f4.