software/ors-amarisoft: slapos-render-config: Prepare to render both enb and gnd

Currently which config to render is hardcoded in this program and only of the
is rendered - currently gnb.  This leads to situation where it is easy to miss
breakage of unselected config.

-> Factor one config rendering into common routine as the preparatory step to
render both enb.cfg and gnb.cfg

/cc @jhuge, @lu.xu, @xavier_thompson, @Daetalus

software/ors-amarisoft/slapos-render-config.py

@@ -34,17 +34,17 @@ def j2render(cfg, jcfg):
       f.write(r._render().decode())
 
 
-config = "gnb"
-json_params_empty = """{
+def do(cfg, slapparameter_dict):
+    jslapparameter_dict = json.dumps(slapparameter_dict)
+    json_params_empty = """{
         "rf_mode": 'fdd',
         "slap_configuration": {
         },
         "directory": {
         },
-    "slapparameter_dict": {
-    }
-}"""
-json_params = """{
+        "slapparameter_dict": %(jslapparameter_dict)s
+    }"""
+    json_params = """{
         "rf_mode": "tdd",
         "trx": "sdr",
         "bbu": "ors",
@@ -80,9 +80,9 @@ json_params = """{
             "etc": "etc",
             "var": "var"
         },
-    "slapparameter_dict": {
-        "tdd_ul_dl_config": "5ms 8UL 1DL 2/10 (maximum uplink)"
-    }
-}"""
+        "slapparameter_dict": %(jslapparameter_dict)s
+    }"""
 
-j2render(config, json_params)
+    j2render(cfg, json_params % locals())
+
+do('gnb', {"tdd_ul_dl_config": "5ms 8UL 1DL 2/10 (maximum uplink)"})