jenkins: Fix cleanup command redirection.

Fix redirection to /dev/null of cleanup commands.  The '2' was being
interpreted as part of the command instead of part of the redirect.

Change-Id: I2e3a591b165e0288c4b82b9ef475fdfd5392a90a

tests/CI/gates.jenkinsfile

@@ -215,8 +215,8 @@ pipeline {
 	}
 	post {
 		cleanup {
-			sh "sudo make distclean 2&>/dev/null || : "
-			sh "sudo rm -rf tests/CI/output  2&>/dev/null || : "
+			sh "sudo make distclean >/dev/null 2>&1 || : "
+			sh "sudo rm -rf tests/CI/output >/dev/null 2>&1 || : "
 		}
 		/*
 		 * The Gerrit Trigger will automatically post the "Verified" results back

tests/CI/periodics-daily.jenkinsfile

@@ -140,8 +140,8 @@ pipeline {
 	}
 	post {
 		cleanup {
-			sh "sudo make distclean 2&>/dev/null || : "
-			sh "sudo rm -rf tests/CI/output  2&>/dev/null || : "
+			sh "sudo make distclean >/dev/null 2>&1 || : "
+			sh "sudo rm -rf tests/CI/output >/dev/null 2>&1 || : "
 		}
 		success {
 			echo "Reporting ${currentBuild.currentResult} Passed"

tests/CI/ref_debug.jenkinsfile

@@ -115,8 +115,8 @@ pipeline {
 	}
 	post {
 		cleanup {
-			sh "sudo make distclean 2&>/dev/null || : "
-			sh "sudo rm -rf tests/CI/output  2&>/dev/null || : "
+			sh "sudo make distclean >/dev/null 2>&1 || : "
+			sh "sudo rm -rf tests/CI/output >/dev/null 2>&1 || : "
 		}
 		success {
 			echo "Reporting ${currentBuild.currentResult} Passed"

tests/CI/unittests.jenkinsfile

@@ -169,8 +169,8 @@ pipeline {
 	}
 	post {
 		cleanup {
-			sh "sudo make distclean 2&>/dev/null || : "
-			sh "sudo rm -rf tests/CI/output 2&>/dev/null || : "
+			sh "sudo make distclean >/dev/null 2>&1 || : "
+			sh "sudo rm -rf tests/CI/output >/dev/null 2>&1 || : "
 		}
 		/*
 		 * The Gerrit Trigger will automatically post the "Verified" results back