increased vbucket filter change timeout. MB-5285
increased vbucket filter change timeout. MB-5285

Apparently in some environment 5 second is too small. Lets make it
bigger so that in those wierd environments rebalance doesn't fail
without good reason.

Change-Id: I8c5d5fe256e090f7d81e52a44002d8dea6ef5f63
Reviewed-on: http://review.couchbase.org/15999
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

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