locator: azure_snitch: use full type name in definition of globals
locator: azure_snitch: use full type name in definition of globals

Some globals in azure_snitch use std::string in the declaration
and auto in the definition. gcc 11 complains. I don't know if it's
correct, but it's easy to use the type in both declaration and
definition.

scylladb/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla