update changelog for 0.17.0 release (engine-1.7)
update changelog for 0.17.0 release (engine-1.7)

vup1120/oq-hazardlib,silviacanessa/oq-hazardlib,gem/oq-engine,gem/oq-hazardlib,gem/oq-engine,silviacanessa/oq-hazardlib,gem/oq-hazardlib,gem/oq-engine,silviacanessa/oq-hazardlib,silviacanessa/oq-hazardlib,gem/oq-engine,vup1120/oq-hazardlib,gem/oq-engine,gem/oq-hazardlib,rcgee/oq-hazardlib,rcgee/oq-hazardlib,vup1120/oq-hazardlib