Update to latest Zap APIs

Trying to stay on top of this so we don't get hit with upgrade
nightmares when we need to upgrade our next dependency.

glide.yaml

@@ -1,6 +1,8 @@
 package: go.uber.org/fx
 import:
 - package: github.com/uber-go/zap
+  # TODO(ai): Pin to semver range after 1.0 is released
+  version: master
 # TODO(glib): Tally pinned for the time being until we've updated to the new API
 - package: github.com/uber-go/tally
   version: 2750b4ae690cbeb294016efe18ceaeb80c4ce17c

ulog/log.go

@@ -72,8 +72,8 @@ type Log interface {
 	// Fatal logs at Fatal level with message, and parameters as key value pairs
 	Fatal(message string, keyvals ...interface{})
 
-	// DFatal logs at Debug level (Fatal for development) with message, and parameters as key value pairs
-	DFatal(message string, keyvals ...interface{})
+	// DPanic logs at Debug level (Fatal for development) with message, and parameters as key value pairs
+	DPanic(message string, keyvals ...interface{})
 }
 
 var _std = defaultLogger()
@@ -131,8 +131,8 @@ func (l *baselogger) Fatal(message string, keyvals ...interface{}) {
 	l.Log(zap.FatalLevel, message, keyvals...)
 }
 
-func (l *baselogger) DFatal(message string, keyvals ...interface{}) {
-	l.log.DFatal(message, l.fieldsConversion(keyvals...)...)
+func (l *baselogger) DPanic(message string, keyvals ...interface{}) {
+	l.log.DPanic(message, l.fieldsConversion(keyvals...)...)
 }
 
 func (l *baselogger) Log(lvl zap.Level, message string, keyvals ...interface{}) {

ulog/log_test.go

@@ -70,11 +70,11 @@ func TestLoggerWithInvalidFields(t *testing.T) {
 		log := Builder().SetLogger(zaplogger).Build()
 		log.Info("info message", "c")
 		log.Info("info message", "c", "d", "e")
-		log.DFatal("debug message")
+		log.DPanic("debug message")
 		assert.Equal(t, []string{
 			`{"level":"info","msg":"info message","error":"invalid number of arguments"}`,
 			`{"level":"info","msg":"info message","error":"invalid number of arguments"}`,
-			`{"level":"error","msg":"debug message"}`,
+			`{"level":"dpanic","msg":"debug message"}`,
 		}, buf.Lines(), "Incorrect output from logger")
 	})
 }