muninlite: revert "correctly parse ifname with - char"

This reverts commit edcad492e1.

Patch is broken and breaking build; reverting until I have time to
investigate.

Reopens #701
Closes #889

Signed-off-by: Jonathan McCrohan <jmccrohan@gmail.com>

admin/muninlite/patches/220-modify-ifname-parser.patch

@@ -1,20 +0,0 @@
---- a/munin-node.in
-+++ b/munin-node.in
-@@ -141,7 +141,7 @@
-   fi
- }
- fetch_if() {
--  IINFO=$(grep "$1:" /proc/net/dev | cut -d: -f2 | sed -e 's/  / /g')
-+  IINFO=$(sed -ne "/^ *${1//_/-}: / { s/^.\+: \+//; s/[[:space:]]\+/ /gp }" /proc/net/dev)
-   echo "down.value" $(echo $IINFO | cut -d\  -f1)
-   echo "up.value" $(echo $IINFO | cut -d\  -f9)
- }
-@@ -162,7 +162,7 @@
-   echo "trans.warning 1"
- }
- fetch_if_err() {
--  IINFO=$(grep "$1:" /proc/net/dev | cut -d: -f2 | sed -e 's/  / /g')
-+  IINFO=$(sed -ne "/^ *${1//_/-}: / { s/^.\+: \+//; s/[[:space:]]\+/ /gp }" /proc/net/dev)
-   echo "rcvd.value" $(echo $IINFO | cut -d\  -f3)
-   echo "trans.value" $(echo $IINFO | cut -d\  -f11)
- }