MB-5323: increased ebucketmigrator connection timeout
MB-5323: increased ebucketmigrator connection timeout

Because I see no good reason why it needs to be as low as 5 seconds
(even though it's huge by machine's terms). We've seen some
virtualization environments causing even greater latencies. Plus under
heavy IO load page faults can sometimes cause comparable latencies
even under "proper" hardware.

Change-Id: Ic32476cec36530d2329ffb997536e37ecd7e9b81
Reviewed-on: http://review.couchbase.org/16199
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

t3rm1n4l/ns_server,mschoch/ns_server,mschoch/ns_server,t3rm1n4l/ns_server,nimishzynga/ns_server,membase/ns_server,pavel-blagodov/ns_server,pavel-blagodov/ns_server,daverigby/ns_server,ceejatec/ns_server,t3rm1n4l/ns_server,daverigby/ns_server,mschoch/ns_server,daverigby/ns_server,nimishzynga/ns_server,mschoch/ns_server,ceejatec/ns_server,mschoch/ns_server,daverigby/ns_server,nimishzynga/ns_server,membase/ns_server,vzasade/ns_server,membase/ns_server,vzasade/ns_server,pavel-blagodov/ns_server,pavel-blagodov/ns_server,membase/ns_server,ceejatec/ns_server,mschoch/ns_server,nimishzynga/ns_server,ceejatec/ns_server,t3rm1n4l/ns_server,daverigby/ns_server,nimishzynga/ns_server,vzasade/ns_server,membase/ns_server,membase/ns_server,vzasade/ns_server,ceejatec/ns_server,ceejatec/ns_server,nimishzynga/ns_server,t3rm1n4l/ns_server