[HOTFIX] Fixing two issues with the release script.

1. The version replacement was still producing some false changes.
2. Uploads to the staging repo specifically.

Author: Patrick Wendell <pwendell@gmail.com>

Closes #3608 from pwendell/release-script and squashes the following commits:

3c63294 [Patrick Wendell] Fixing two issues with the release script:

dev/create-release/create-release.sh

@@ -39,7 +39,6 @@ RC_NAME=${RC_NAME:-rc2}
 M2_REPO=~/.m2/repository
 SPARK_REPO=$M2_REPO/org/apache/spark
 NEXUS_ROOT=https://repository.apache.org/service/local/staging
-NEXUS_UPLOAD=$NEXUS_ROOT/deploy/maven2
 NEXUS_PROFILE=d63f592e7eac0 # Profile for Spark staging uploads
 
 if [ -z "$JAVA_HOME" ]; then
@@ -64,19 +63,28 @@ if [[ ! "$@" =~ --package-only ]]; then
   # NOTE: This is done "eagerly" i.e. we don't check if we can succesfully build
   # or before we coin the release commit. This helps avoid races where
   # other people add commits to this branch while we are in the middle of building.
-  old="  <version>${RELEASE_VERSION}-SNAPSHOT<\/version>"
-  new="  <version>${RELEASE_VERSION}<\/version>"
-  find . -name pom.xml -o -name package.scala | grep -v dev | xargs -I {} sed -i \
-    -e "s/$old/$new/" {}
+  cur_ver="${RELEASE_VERSION}-SNAPSHOT"
+  rel_ver="${RELEASE_VERSION}"
+  next_ver="${NEXT_VERSION}-SNAPSHOT"
+
+  old="^\( \{2,4\}\)<version>${cur_ver}<\/version>$"
+  new="\1<version>${rel_ver}<\/version>"
+  find . -name pom.xml | grep -v dev | xargs -I {} sed -i \
+    -e "s/${old}/${new}/" {}
+  find . -name package.scala | grep -v dev | xargs -I {} sed -i \
+    -e "s/${old}/${new}/" {}
+
   git commit -a -m "Preparing Spark release $GIT_TAG"
   echo "Creating tag $GIT_TAG at the head of $GIT_BRANCH"
   git tag $GIT_TAG
 
-  old="  <version>${RELEASE_VERSION}<\/version>"
-  new="  <version>${NEXT_VERSION}-SNAPSHOT<\/version>"
-  find . -name pom.xml -o -name package.scala | grep -v dev | xargs -I {} sed -i \
+  old="^\( \{2,4\}\)<version>${rel_ver}<\/version>$"
+  new="\1<version>${next_ver}<\/version>"
+  find . -name pom.xml | grep -v dev | xargs -I {} sed -i \
     -e "s/$old/$new/" {}
-  git commit -a -m "Preparing development version ${NEXT_VERSION}-SNAPSHOT"
+  find . -name package.scala | grep -v dev | xargs -I {} sed -i \
+    -e "s/${old}/${new}/" {}
+  git commit -a -m "Preparing development version $next_ver"
   git push origin $GIT_TAG
   git push origin HEAD:$GIT_BRANCH
   git checkout -f $GIT_TAG 
@@ -118,12 +126,13 @@ if [[ ! "$@" =~ --package-only ]]; then
     gpg --print-md SHA1 $file > $file.sha1
   done
 
-  echo "Uplading files to $NEXUS_UPLOAD"
+  nexus_upload=$NEXUS_ROOT/deployByRepositoryId/$staged_repo_id
+  echo "Uplading files to $nexus_upload"
   for file in $(find . -type f)
   do
     # strip leading ./
     file_short=$(echo $file | sed -e "s/\.\///")
-    dest_url="$NEXUS_UPLOAD/org/apache/spark/$file_short"
+    dest_url="$nexus_upload/org/apache/spark/$file_short"
     echo "  Uploading $file_short"
     curl -u $ASF_USERNAME:$ASF_PASSWORD --upload-file $file_short $dest_url
   done