chore: Update KS + MM install script (kubeflow#2316)

Reference the latest release branch and ensure that
the ModelMesh controller is installed in the same
namespace as the KServe controller.

Signed-off-by: Paul Van Eck <pvaneck@us.ibm.com>

hack/install_kserve_mm.sh

@@ -38,12 +38,12 @@ Help()
    echo
 }
 
-export CTLR_NS="modelmesh-serving"
+export CTLR_NS="kserve"
 export USER_NS=$(kubectl config  get-contexts $(kubectl config current-context) |tail -1|awk '{ print $5 }')
 export user_ns_array=()
 export C_DIR="$PWD"
-export KSERVE_BRANCH="release-0.8"
-export MMS_BRANCH="release-0.8"
+export KSERVE_BRANCH="release-0.9"
+export MMS_BRANCH="release-0.9"
 
 while (($# > 0)); do
   case "$1" in