[chore] Remove JRuby < 1.7 backward compatibility logic

Author: chadlwilson

src/main/ruby/jruby/rack/capture.rb

@@ -47,11 +47,7 @@ def capture
           if JRuby.runtime.instance_config.respond_to?(:trace_type)
             trace_type = JRuby.runtime.instance_config.trace_type # getTraceType
             begin
-              if JRUBY_VERSION < '1.7'
-                full_trace = trace_type.print_backtrace(self)
-              else
-                full_trace = trace_type.print_backtrace(self, false)
-              end
+              full_trace = trace_type.print_backtrace(self, false)
             rescue => e
               warn "failed to print backtrace due: #{e}" rescue nil
               full_trace = backtrace.join("\n")

src/spec/ruby/cgi/session/java_servlet_store_spec.rb

@@ -171,6 +171,6 @@ def hmac(key, data)
       expect(@session).to receive(:getLastAccessedTime).and_return 123
       expect(@session).to receive(:setAttribute).with("__rails_secret", "abcrandom123")
       expect(@dbman.generate_digest("key")).to eq(hmac("abcrandom123", "key"))
-    end unless JRUBY_VERSION < '1.7.0'
+    end
   end
 end