playground: Change calls to principal tool.

MultiPart: 2/3
Change-Id: I72d6e4f3b522525b733efa545d73e24c49df9771
diff --git a/client/lib/shell/shell_test.sh b/client/lib/shell/shell_test.sh
index 98dca2a..d7f147c 100755
--- a/client/lib/shell/shell_test.sh
+++ b/client/lib/shell/shell_test.sh
@@ -244,8 +244,8 @@
   local -r FORKCRED=$(shell::tmp_dir)
   "${PRINCIPAL_BIN}" create --overwrite=true "${FORKCRED}" self >/dev/null || shell_test::fail "line ${LINENO}: create failed"
   "${PRINCIPAL_BIN}" --veyron.credentials="$1" bless --require_caveats=false "${FORKCRED}" "$2" >blessing || shell_test::fail "line ${LINENO}: bless failed"
-  "${PRINCIPAL_BIN}" --veyron.credentials="${FORKCRED}" store setdefault blessing || shell_test::fail "line ${LINENO}: store setdefault failed"
-  "${PRINCIPAL_BIN}" --veyron.credentials="${FORKCRED}" store set blessing ... || shell_test::fail "line ${LINENO}: store set failed"
+  "${PRINCIPAL_BIN}" --veyron.credentials="${FORKCRED}" set default blessing || shell_test::fail "line ${LINENO}: set default failed"
+  "${PRINCIPAL_BIN}" --veyron.credentials="${FORKCRED}" set forpeer blessing ... || shell_test::fail "line ${LINENO}: set forpeer failed"
   echo "${FORKCRED}"
 }
 
diff --git a/go/src/playground/builder/credentials.go b/go/src/playground/builder/credentials.go
index 65c7195..5177582 100644
--- a/go/src/playground/builder/credentials.go
+++ b/go/src/playground/builder/credentials.go
@@ -51,32 +51,32 @@
 }
 
 func (c credentials) initWithDuration() error {
-	// (1) principal blessself --for=<duration> <c.Name> | principal store setdefault -
-	// (2) principal store default | principal store set - ...
+	// (1) principal blessself --for=<duration> <c.Name> | principal set default -
+	// (2) principal get default | principal set forpeer - ...
 	if err := c.pipe(c.toolCmd(c.Name, "blessself", "--for", c.Duration),
-		c.toolCmd(c.Name, "store", "setdefault", "-")); err != nil {
+		c.toolCmd(c.Name, "set", "default", "-")); err != nil {
 		return err
 	}
-	if err := c.pipe(c.toolCmd(c.Name, "store", "default"),
-		c.toolCmd(c.Name, "store", "set", "-", "...")); err != nil {
+	if err := c.pipe(c.toolCmd(c.Name, "get", "default"),
+		c.toolCmd(c.Name, "set", "forpeer", "-", "...")); err != nil {
 		return err
 	}
 	return nil
 }
 
 func (c credentials) getblessed() error {
-	// (1) V23_CREDENTIALS=<c.Blesser> principal bless <c.Name> --for=<c.Duration> <c.Name> | V23_CREDENTIALS=<c.Name> principal store setdefault -
-	// (2) principal store default | principal store set - ...
+	// (1) V23_CREDENTIALS=<c.Blesser> principal bless <c.Name> --for=<c.Duration> <c.Name> | V23_CREDENTIALS=<c.Name> principal set default -
+	// (2) principal get default | principal set forpeer - ...
 	duration := c.Duration
 	if duration == "" {
 		duration = "1h"
 	}
 	if err := c.pipe(c.toolCmd(c.Blesser, "bless", "--for", duration, path.Join(credentialsDir, c.Name), c.Name),
-		c.toolCmd(c.Name, "store", "setdefault", "-")); err != nil {
+		c.toolCmd(c.Name, "set", "default", "-")); err != nil {
 		return err
 	}
-	if err := c.pipe(c.toolCmd(c.Name, "store", "default"),
-		c.toolCmd(c.Name, "store", "set", "-", "...")); err != nil {
+	if err := c.pipe(c.toolCmd(c.Name, "get", "default"),
+		c.toolCmd(c.Name, "set", "forpeer", "-", "...")); err != nil {
 		return err
 	}
 	return nil