added '-f' to the checkout flags for git

dev/run-tests-jenkins

@@ -47,7 +47,7 @@ COMMIT_URL="https://github.com/apache/spark/commit/${ghprbActualCommit}"
 # GitHub doesn't auto-link short hashes when submitted via the API, unfortunately. :(
 SHORT_COMMIT_HASH="${ghprbActualCommit:0:7}"
 
-TESTS_TIMEOUT="150m" # format: http://linux.die.net/man/1/timeout
+TESTS_TIMEOUT="120m" # format: http://linux.die.net/man/1/timeout
 
 # Array to capture all tests to run on the pull request. These tests are held under the
 #+ dev/tests/ directory.

dev/tests/pr_new_dependencies.sh

@@ -39,12 +39,12 @@ CURR_CP_FILE="my-classpath.txt"
 MASTER_CP_FILE="master-classpath.txt"
 
 # First switch over to the master branch
-git checkout master &>/dev/null
+git checkout -f master &>/dev/null
 # Find and copy all pom.xml files into a *.gate file that we can check
 # against through various `git` changes
 find -name "pom.xml" -exec cp {} {}.gate \;
 # Switch back to the current PR
-git checkout "${current_pr_head}" &>/dev/null
+git checkout -f "${current_pr_head}" &>/dev/null
 
 # Check if any *.pom files from the current branch are different from the master
 difference_q=""
@@ -71,7 +71,7 @@ else
     sort > ${CURR_CP_FILE}
 
   # Checkout the master branch to compare against
-  git checkout master &>/dev/null
+  git checkout -f master &>/dev/null
 
   ${MVN_BIN} clean package dependency:build-classpath -DskipTests 2>/dev/null | \
     sed -n -e '/Building Spark Project Assembly/,$p' | \