ovsdb: Add delay after ovsdb start

ovsdb: Add delay after ovsdb start

Ovsdb must be up and running before any configuration
option is modified or vswitchd is executed.
Otherwise options won't be modified in DB and/or vswitchd
won't be able to use correct options during start up.

Change-Id: I04948d383272f2e694ec685b3a21d639068125ca
JIRA: VSPERF-291
Signed-off-by: Martin Klozik <martinx.klozik@intel.com>
Reviewed-by: Maryam Tahhan <maryam.tahhan@intel.com>
Reviewed-by: Al Morton <acmorton@att.com>
Reviewed-by: Christian Trautman <ctrautma@redhat.com>
Reviewed-by: Brian Castelli <brian.castelli@spirent.com>