Adding workaround for a busybox bug with grep -w.

See: https://bugs.busybox.net/show_bug.cgi?id=4520

scripts/live

@@ -399,7 +399,7 @@ Arguments ()
 	then
 		PERSISTENT_ENCRYPTION="none"
 		export PERSISTENT_ENCRYPTION
-	elif echo ${PERSISTENT_ENCRYPTION} | grep -qw luks
+	elif echo ${PERSISTENT_ENCRYPTION} | grep -qe "\<luks\>"
 	then
 		if ! modprobe dm-crypt
 		then
@@ -1403,12 +1403,12 @@ setup_unionfs ()
 				;;
 		esac
 
-		if echo ${PERSISTENT_METHOD} | grep -qw overlay
+		if echo ${PERSISTENT_METHOD} | grep -qe "\<overlay\>"
 		then
 			overlays="${root_persistence} ${home_persistence}"
 		fi
 
-		if echo ${PERSISTENT_METHOD} | grep -qw snapshot
+		if echo ${PERSISTENT_METHOD} | grep -qe "\<snapshot\>"
 		then
 			snapshots="${root_snapshot_label} ${home_snapshot_label}"
 		fi

scripts/live-helpers

@@ -46,9 +46,9 @@ storage_devices()
 	do
 		fulldevname=$(sys2dev "${sysblock}")
 
-		if echo "${black_listed_devices}" | grep -qw "${fulldevname}" || \
+		if echo "${black_listed_devices}" | grep -qe "\<${fulldevname}\>" || \
 			[ -n "${white_listed_devices}" ] && \
-			echo "${white_listed_devices}" | grep -vqw "${fulldevname}"
+			echo "${white_listed_devices}" | grep -qve "\<${fulldevname}\>"
 		then
 			# skip this device entirely
 			continue
@@ -58,7 +58,7 @@ storage_devices()
 		do
 			devname=$(sys2dev "${dev}")
 
-			if echo "${black_listed_devices}" | grep -qw "${devname}"
+			if echo "${black_listed_devices}" | grep -qe "\<${devname}\>"
 			then
 				# skip this subdevice
 				continue
@@ -379,7 +379,7 @@ find_persistent_media ()
 		luks_device=""
 
 		# Checking for a luks device
-		if echo ${PERSISTENT_ENCRYPTION} | grep -qw luks && \
+		if echo ${PERSISTENT_ENCRYPTION} | grep -qe "\<luks\>" && \
 		   /sbin/cryptsetup isLuks ${dev}
 		then
 			if luks_device=$(open_luks_device "${dev}")
@@ -389,13 +389,13 @@ find_persistent_media ()
 				# skip $dev since we failed/chose not to open it
 				continue
 			fi
-		elif echo ${PERSISTENT_ENCRYPTION} | grep -qwv none
+		elif echo ${PERSISTENT_ENCRYPTION} | grep -qve "\<none\>"
 		then
 			# skip $dev since we don't allow unencrypted storage
 			continue
 		fi
 
-		if echo ${PERSISTENT_STORAGE} | grep -qw filesystem
+		if echo ${PERSISTENT_STORAGE} | grep -qe "\<filesystem\>"
 		then
 			for label in ${overlays} ${snapshots}
 			do
@@ -410,7 +410,7 @@ find_persistent_media ()
 			done
 		fi
 
-		if echo ${PERSISTENT_STORAGE} | grep -qw file
+		if echo ${PERSISTENT_STORAGE} | grep -qe "\<file\>"
 		then
 			devfstype="$(get_fstype ${dev})"
 			overlay_on_dev=""