Match "Cayman Islands" to geographic location

Similar to previous commit, this is part of effort to match places to
the geographic location rather than diplomatic semantics.
Match "Cayman Islands" to its geographic location:

    region = North America
    country = Cayman Islands
    division = Cayman Islands

augur/data/geolocation_rules.tsv

@@ -8017,6 +8017,10 @@ Europe/Spain/Canaray Islands/*	Africa/Canary Islands/Canary Islands/*
 Europe/Spain/Canarias/*	Africa/Canary Islands/Canary Islands/*
 Europe/Spain/Islas Canarias/*	Africa/Canary Islands/Canary Islands/*
 
+# Cayman Islands (British territory)
+North America/Caribbean/Cayman Islands/	North America/Cayman Islands/Cayman Islands/
+North America/Cayman Islands/*/*	North America/Cayman Islands/Cayman Islands/*
+
 # Chile
 South America/Chile/Aisen/*	South America/Chile/Aysén/*
 South America/Chile/Antofagasta./*	South America/Chile/Antofagasta/*
@@ -44908,8 +44912,6 @@ Europe/United Kingdom/Null/	Europe/United Kingdom/United Kingdom/
 Europe/United Kingdom/Oxford/*	Europe/United Kingdom/England/Oxford GB
 Europe/United Kingdom/Scotland/Fraserburg	Europe/United Kingdom/Scotland/Fraserburgh
 Europe/United Kingdom/Suffolk/	Europe/United Kingdom/England/Suffolk
-North America/Caribbean/Cayman Islands/	Europe/United Kingdom/Cayman Islands/
-North America/Cayman Islands/*/*	Europe/United Kingdom/Cayman Islands/*
 North America/Montserrat//	Europe/United Kingdom/Montserrat/
 North America/Montserrat/Caribbean/*	Europe/United Kingdom/Montserrat/*
 North America/Montserrat/Montserrat/*	Europe/United Kingdom/Montserrat/*