Drop support for 2.10, 2.11 and 2.12

As 2.10 is no longer supported, there is no need to build dCache with
Java 7.  Therefore support for choosing which Java version is also
removed.

bin/tag-releases

@@ -30,14 +30,14 @@ fi
 if [ $# -gt 0 ]; then
     BRANCHES="$@"
 else
-    BRANCHES="3.1 3.0 2.16 2.15 2.14 2.13 2.12 2.11 2.10"
+    BRANCHES="3.1 3.0 2.16 2.15 2.14 2.13"
 fi
 
 for branch in $BRANCHES; do
     case "$branch" in
         2.[0-9]*)
             case "${branch#2.}" in
-                6|7|8|9|10|11|12|13|14|15|16)
+                13|14|15|16)
                     #  Valid
                     ;;
                 *)
@@ -61,18 +61,6 @@ for branch in $BRANCHES; do
     esac
 done
 
-java_home_for_tag() {
-    case $1 in
-        2.10* | 2.9* | 2.8* | 2.7* | 2.6*)
-            echo $JDK7_HOME
-            ;;
-
-        *)
-            echo $JDK8_HOME
-            ;;
-    esac
-}
-
 branches_to_release() {
     git fetch $git_remote_branch
 
@@ -133,7 +121,6 @@ for branch in $release_branches; do
     git checkout -q $branch
     git clean -df >/dev/null
     next_tag=$(sed -n '/version/s/[^0-9]*\([0-9.]*\).*/\1/p' pom.xml |head -1)
-    export JAVA_HOME=$(java_home_for_tag ${next_tag})
     echo
     echo "==="
     echo "===    Preparing for $next_tag"

etc/paths

@@ -2,8 +2,3 @@
 #  Locations of various tools
 
 MULTIMARKDOWN=$HOME/git/peg-multimarkdown/multimarkdown
-
-#  Paths of various directories
-
-JDK7_HOME=/usr/lib/jvm/java-7-openjdk-amd64
-JDK8_HOME=/usr/lib/jvm/java-8-oracle