allow dialogs to be not automatically closed on hash change
allow dialogs to be not automatically closed on hash change

I'm not sure we should be doing that in default case but default is a
bit not right time to change now. So we have new option to stop that
behavior.

This is needed for next commit that's fixing MB-5275

Change-Id: I8fcb8b15fbb58a488bbbb7cf40b3a1e295153a2c
Reviewed-on: http://review.couchbase.org/15820
Reviewed-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

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