Increase wait time during echo_server's pid-file check

Increase wait time during echo_server's pid-file check

We used to sleep for 200 microseconds in each iteration for checking
the existence of echo server's pid file which seems to be very short.
In order to avoid chances of failures to detect this pid file within
100 such iterations its better to increase this wait time to 2000
microseconds.

Signed-off-by: Anoop C S <anoopcs@redhat.com>
Reviewed-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Michael Adam <obnox@samba.org>