OTA testing 4G, configuration parameters for fairRR scheduler and common parameters for both fairRR and default

cmake_targets/tools/build_helper

@@ -113,6 +113,7 @@ check_supported_distribution() {
         "rhel7.6")     return 0 ;;
         "rhel7.7")     return 0 ;;
         "rhel7.8")     return 0 ;;
+	"rhel7.9")     return 0 ;;
         "rhel8.2")     return 0 ;;
         "rhel8.3")     return 0 ;;
         "rhel8.4")     return 0 ;;
@@ -315,7 +316,7 @@ install_usrp_uhd_driver_from_source(){
     rm -rf /tmp/uhd
     git clone https://github.com/EttusResearch/uhd.git
     cd uhd
-    git checkout tags/v4.0.0.0
+    git checkout tags/v3.14.0.0
     mkdir -p host/build
     cd host/build
     $CMAKE ../