Description of problem:
When the Directory Server abnormally exits and leaves PID files, the pid rarely
matches the pid of other existing process.  It prevents the server's start.

Step to reproduce:
$ ps -ef | egrep 1111
nhosoi    1111  9492  0 Jun22 pts/2    00:00:00 vim bogus
# stop the server:
$ lib/fedora-ds/slapd-laputa/stop-slapd
# create pid files that store the existing pid 1111:
$ echo 1111 > var/run/fedora-ds/slapd-laputa.pid
$ echo 1111 > var/run/fedora-ds/slapd-laputa.startpid
# start the server:
$ lib/fedora-ds/slapd-laputa/start-slapd
There is an ns-slapd process already running: 1111

The check is being done in start-slapd.  We could check the process name and
remove the pid files and start the server if the process is not ns-slapd.