config: default branches to stable variants

Makefile

@@ -92,14 +92,14 @@ PORTSREFBRANCH?=master
 
 PLUGINSENV?=	PLUGIN_PHP=${PHP} PLUGIN_ABI=${SETTINGS} PLUGIN_PYTHON=${PYTHON}
 PLUGINSDIR?=	/usr/plugins
-PLUGINSBRANCH?=	master
+PLUGINSBRANCH?=	stable/${SETTINGS}
 PORTSDIR?=	/usr/ports
 PORTSBRANCH?=	master
 COREDIR?=	/usr/core
-COREBRANCH?=	master
+COREBRANCH?=	stable/${SETTINGS}
 COREENV?=	CORE_PHP=${PHP} CORE_ABI=${SETTINGS} CORE_PYTHON=${PYTHON}
 SRCDIR?=	/usr/src
-SRCBRANCH?=	master
+SRCBRANCH?=	stable/${SETTINGS}
 
 # for plugins and core
 DEVELBRANCH?=	#master

config/20.1/build.conf

@@ -3,7 +3,4 @@ PHP?=		73
 PYTHON?=	37
 RUBY?=		26
 
-COREBRANCH?=	stable/20.1
-PLUGINSBRANCH?=	stable/20.1
 PORTSBRANCH?=	stable/20.1
-SRCBRANCH?=	stable/20.1

config/20.7/build.conf

@@ -3,9 +3,5 @@ PHP?=		73
 PYTHON?=	37
 RUBY?=		26
 
-COREBRANCH?=	stable/20.7
-PLUGINSBRANCH?= stable/20.7
-SRCBRANCH?=	master
-
 COREENV=	CORE_PHP=${PHP} CORE_ABI=${SETTINGS} CORE_PYTHON=${PYTHON} \
 		CORE_SURICATA=