[source] build: use SNAPSHOT instead of CURRENT to designate untagged branch builds

[LEDE Commits]

jow pushed a commit to source.git, branch master:
https://git.lede-project.org/a4232cd4bfa9d244a0b763742564f22d15264839

commit a4232cd4bfa9d244a0b763742564f22d15264839
Author: Jo-Philipp Wich <jo at mein.io>
AuthorDate: Fri Dec 2 22:11:40 2016 +0100

    build: use SNAPSHOT instead of CURRENT to designate untagged branch builds
    
    Calling a build ##.##-CURRENT might mislead users into thinking that this
    build is the most current release of a branch.
    
    Signed-off-by: Jo-Philipp Wich <jo at mein.io>
---
 include/version.mk                 | 2 +-
 package/base-files/image-config.in | 8 ++++----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/include/version.mk b/include/version.mk
index a21bf25..1a0d3c9 100644
--- a/include/version.mk
+++ b/include/version.mk
@@ -31,7 +31,7 @@ qstrip_escape=$(subst ','\'',$(call qstrip,$(1)))
 sanitize = $(call tolower,$(subst _,-,$(subst $(space),-,$(1))))
 
 VERSION_NUMBER:=$(call qstrip_escape,$(CONFIG_VERSION_NUMBER))
-VERSION_NUMBER:=$(if $(VERSION_NUMBER),$(VERSION_NUMBER),CURRENT)
+VERSION_NUMBER:=$(if $(VERSION_NUMBER),$(VERSION_NUMBER),SNAPSHOT)
 
 VERSION_CODE:=$(call qstrip_escape,$(CONFIG_VERSION_CODE))
 VERSION_CODE:=$(if $(VERSION_CODE),$(VERSION_CODE),$(REVISION))
diff --git a/package/base-files/image-config.in b/package/base-files/image-config.in
index b18f2d8..a8d82d3 100644
--- a/package/base-files/image-config.in
+++ b/package/base-files/image-config.in
@@ -175,8 +175,8 @@ if VERSIONOPT
 		prompt "Release version number"
 		help
 			This is the release version number embedded in the image.
-			If unspecified, it defaults to CURRENT for the master branch
-			or to ##.##-CURRENT on release branches.
+			If unspecified, it defaults to SNAPSHOT for the master branch
+			or to ##.##-SNAPSHOT on release branches.
 
 	config VERSION_CODE
 		string
@@ -195,8 +195,8 @@ if VERSIONOPT
 			This is the repository address embedded in the image, it defaults
 			to the trunk snapshot repo; the url may contain the following placeholders:
 			 %R .. Repository revision ID
-			 %V .. Configured release version number or "CURRENT", uppercase
-			 %v .. Configured release version number or "current", lowercase
+			 %V .. Configured release version number or "SNAPSHOT", uppercase
+			 %v .. Configured release version number or "snapshot", lowercase
 			 %C .. Configured release revision code or value of %R, uppercase
 			 %c .. Configured release revision code or value of %R, lowercase
 			 %N .. Release name, uppercase