Modifying scripts to accomodate pagination changes

Recent pagination changes to ifmap requires changes to our script. Modifying the script to get only the exact match.
Correcting re requirement

Change-Id: I7a0ea83c040f6f304ad94747addc623346f94780
Closes-Bug: 1457216

scripts/scale/control-node/cn_introspect_bgp.py

@@ -38,7 +38,10 @@ def http_get(self, path):
 
     def _get_if_map_table_entry(self, match):
         d = None
-        p = self.http_get('Snh_IFMapTableShowReq')
+        #Changes to paging will require fetching particular element rather than entire data
+        table_name = re.match('(\S+?):', match)
+        new_table_req = 'Snh_IFMapTableShowReq?table_name=' + table_name.group(1) + '&search_string=' + match
+        p = self.dict_get(new_table_req)
         xp = p.xpath('./IFMapTableShowResp/ifmap_db/list/IFMapNodeShowInfo')
         f = filter(lambda x: x.xpath('./node_name')[0].text == match, xp)
         if 1 == len(f):

tcutils/control/cn_introspect_utils.py

@@ -1,6 +1,6 @@
 import logging as LOG
 from lxml import etree
-
+import re
 from tcutils.verification_util import *
 from tcutils.util import is_v6
 from netaddr import IPNetwork, AddrFormatError
@@ -20,7 +20,10 @@ def _join(self, *args):
 
     def _get_if_map_table_entry(self, match):
         d = None
-        p = self.dict_get('Snh_IFMapTableShowReq')
+        #Changes to paging will require fetching particular element rather than entire data
+        table_name = re.match('(\S+?):', match)
+        new_table_req = 'Snh_IFMapTableShowReq?table_name=' + table_name.group(1) + '&search_string=' + match
+        p = self.dict_get(new_table_req)
         xp = p.xpath('./IFMapTableShowResp/ifmap_db/list/IFMapNodeShowInfo')
         if not xp:
             # sometime ./xpath dosen't work; work around