classes/lib: Add expand parameter to getVarFlag

This sets the scene for removing the default False for expansion
from getVarFlag. This would later allow True to become the default.

On the most part this is an automatic translation with:

sed -e 's:\(\.getVarFlag([^,()]*, [^,()]*\)):\1, True):g'  -i `grep -ril getVar *`

In this case, the default was False, but True was used since in most
cases here expansion would be expected.

(From OE-Core rev: 42a10788e89b07b14a150ced07113566cf99fcdd)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/devshell.bbclass

@@ -3,7 +3,7 @@ inherit terminal
 DEVSHELL = "${SHELL}"
 
 python do_devshell () {
-    if d.getVarFlag("do_devshell", "manualfakeroot"):
+    if d.getVarFlag("do_devshell", "manualfakeroot", True):
        d.prependVar("DEVSHELL", "pseudo ")
        fakeenv = d.getVar("FAKEROOTENV", True).split()
        for f in fakeenv:
@@ -27,7 +27,7 @@ do_devshell[nostamp] = "1"
 # be done as the normal user. We therfore carefully construct the envionment
 # manually
 python () {
-    if d.getVarFlag("do_devshell", "fakeroot"):
+    if d.getVarFlag("do_devshell", "fakeroot", True):
        # We need to signal our code that we want fakeroot however we
        # can't manipulate the environment and variables here yet (see YOCTO #4795)
        d.setVarFlag("do_devshell", "manualfakeroot", "1")