changed default log file name to info
changed default log file name to info

Because it's info level and higher

Change-Id: I2a64a55a5d6913ac37fcf99e22b1bdb8db624eb8
Reviewed-on: http://review.couchbase.org/15327
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

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