RM-1465: ProxySQL 2.7.1

https://perconadev.atlassian.net/browse/RM-1465

***
Bump the version to '2.7.1'

***
Fixed the unstable `sync many users` test.

***
Made the testing script to use PXC built with glibc-2.35.

proxysql-common

@@ -47,7 +47,7 @@ fi
 #
 # Script parameters/constants
 #
-readonly    PROXYSQL_ADMIN_VERSION="2.6.5"
+readonly    PROXYSQL_ADMIN_VERSION="2.7.1"
 
 # The minimum required openssl version
 readonly    REQUIRED_OPENSSL_VERSION="1.1.1"

tests/proxysql-admin-testsuite.bats

@@ -297,9 +297,10 @@ fi
 
   time_taken=$((end_time - start_time))
 
+  echo "time taken: $time_taken seconds"
   # Expected time to process 1000 users is about 25 seconds.
-  # For this test, lets assume that it takes less than a minute.
-  [[ $time_taken -le 60 ]]
+  # For this test, lets assume that it takes less than 2 minutes.
+  [[ $time_taken -le 120 ]]
 
   echo "$output" >&2
   [ "$status" -eq  0 ]

tests/setup_workdir.sh

@@ -142,7 +142,7 @@ echo "...Copying done"
 
 if [[ ! $SKIP_DOWNLOAD -eq 1 ]];then
   echo "Fetching the PXC tarball packages"
-  wget -O $WORKDIR/Percona-XtraDB-Cluster_${LATEST_VERSION}_Linux.x86_64.glibc2.17-minimal.tar.gz https://www.percona.com/downloads/Percona-XtraDB-Cluster-LATEST/Percona-XtraDB-Cluster-${LATEST_VERSION}/binary/tarball/Percona-XtraDB-Cluster_${LATEST_VERSION}-${VERSION_SUFFIX}_Linux.x86_64.glibc2.17-minimal.tar.gz
+  wget -O $WORKDIR/Percona-XtraDB-Cluster_${LATEST_VERSION}_Linux.x86_64.glibc2.35-minimal.tar.gz https://www.percona.com/downloads/Percona-XtraDB-Cluster-LATEST/Percona-XtraDB-Cluster-${LATEST_VERSION}/binary/tarball/Percona-XtraDB-Cluster_${LATEST_VERSION}-${VERSION_SUFFIX}_Linux.x86_64.glibc2.35-minimal.tar.gz
   echo "...Successful"
 fi