csparser: make the reTrailLoc_ regex stricter

... so that it does not trigger on similar constructions in code
snippets contained in comments.  The following defecet detected
by Pylint on calamari-server-1.3.4-1.el7cp caused a major problem
to csparser:

    Error: PROSPECTOR_WARNING:
    /opt/calamari/venv/lib/python2.7/site-packages/graphite/thirdparty/pyparsing.py:795:24: W0613[pylint]: Unused argument 's'
    #  793|                       return f(f.__call__.__self__, s,l,t)
    #  794|               if numargs == 2:
    #  795|->                 def tmp(s,l,t):
    #  796|                       return f(l,t)
    #  797|               elif numargs == 1:

Author: kdudka

csparser.cc

@@ -35,7 +35,7 @@ class LineReader {
         LineReader(std::istream &input):
             input_(input),
             lineNo_(0),
-            reTrailLoc_("[0-9>]:$"),
+            reTrailLoc_("^(path:|/).*(:[0-9]+|<.*>):$"),
             rePathPref_("^path:"),
             reUnkownLoc_("^<unknown>")
         {

tests/CMakeLists.txt

@@ -146,6 +146,7 @@ test_csgrep(csgrep      "36-csgrep-json"              )
 test_csgrep(csgrep      "37-csgrep-json"              )
 test_csgrep(csgrep      "38-csparser-remediation"     )
 test_csgrep(csgrep      "39-csparser-remediation"     )
+test_csgrep(csgrep      "40-csparser-code-snippet"    )
 test_csparser(csparser-5.8                          00)
 test_csparser(csparser-5.8                          01)
 test_csparser(csparser-5.8                          02)

tests/csgrep/40-csparser-code-snippet-args.txt

@@ -0,0 +1,31 @@
+Error: PROSPECTOR_WARNING:
+/opt/calamari/venv/lib/python2.7/site-packages/graphite/thirdparty/pyparsing.py:724:30: W0212[pylint]: Access to a protected member _originalParseMethod of a client class
+#  722|           else:
+#  723|               if hasattr(self._parse,"_originalParseMethod"):
+#  724|->                 self._parse = self._parse._originalParseMethod
+#  725|           return self
+#  726|   
+
+Error: PROSPECTOR_WARNING:
+/opt/calamari/venv/lib/python2.7/site-packages/graphite/thirdparty/pyparsing.py:795:24: W0613[pylint]: Unused argument 's'
+#  793|                       return f(f.__call__.__self__, s,l,t)
+#  794|               if numargs == 2:
+#  795|->                 def tmp(s,l,t):
+#  796|                       return f(l,t)
+#  797|               elif numargs == 1:
+
+Error: PROSPECTOR_WARNING:
+/opt/calamari/venv/lib/python2.7/site-packages/graphite/thirdparty/pyparsing.py:798:24: W0613[pylint]: Unused argument 's'
+#  796|                       return f(l,t)
+#  797|               elif numargs == 1:
+#  798|->                 def tmp(s,l,t):
+#  799|                       return f(t)
+#  800|               else: #~ numargs == 0:
+
+Error: PROSPECTOR_WARNING:
+/opt/calamari/venv/lib/python2.7/site-packages/graphite/thirdparty/pyparsing.py:798:26: W0613[pylint]: Unused argument 'l'
+#  796|                       return f(l,t)
+#  797|               elif numargs == 1:
+#  798|->                 def tmp(s,l,t):
+#  799|                       return f(t)
+#  800|               else: #~ numargs == 0:

tests/csgrep/40-csparser-code-snippet-stdin.txt

@@ -0,0 +1,31 @@
+Error: PROSPECTOR_WARNING:
+/opt/calamari/venv/lib/python2.7/site-packages/graphite/thirdparty/pyparsing.py:724:30: W0212[pylint]: Access to a protected member _originalParseMethod of a client class
+#  722|           else:
+#  723|               if hasattr(self._parse,"_originalParseMethod"):
+#  724|->                 self._parse = self._parse._originalParseMethod
+#  725|           return self
+#  726|   
+
+Error: PROSPECTOR_WARNING:
+/opt/calamari/venv/lib/python2.7/site-packages/graphite/thirdparty/pyparsing.py:795:24: W0613[pylint]: Unused argument 's'
+#  793|                       return f(f.__call__.__self__, s,l,t)
+#  794|               if numargs == 2:
+#  795|->                 def tmp(s,l,t):
+#  796|                       return f(l,t)
+#  797|               elif numargs == 1:
+
+Error: PROSPECTOR_WARNING:
+/opt/calamari/venv/lib/python2.7/site-packages/graphite/thirdparty/pyparsing.py:798:24: W0613[pylint]: Unused argument 's'
+#  796|                       return f(l,t)
+#  797|               elif numargs == 1:
+#  798|->                 def tmp(s,l,t):
+#  799|                       return f(t)
+#  800|               else: #~ numargs == 0:
+
+Error: PROSPECTOR_WARNING:
+/opt/calamari/venv/lib/python2.7/site-packages/graphite/thirdparty/pyparsing.py:798:26: W0613[pylint]: Unused argument 'l'
+#  796|                       return f(l,t)
+#  797|               elif numargs == 1:
+#  798|->                 def tmp(s,l,t):
+#  799|                       return f(t)
+#  800|               else: #~ numargs == 0: