feature to localize prompt search login to iosxr shared module

this localizes the cli prompt search logic to the iosxr shared module
instead of using the common regexp list in shell.py

lib/ansible/module_utils/iosxr.py

@@ -27,6 +27,21 @@ NET_COMMON_ARGS = dict(
     provider=dict()
 )
 
+CLI_PROMPTS_RE = [
+    re.compile(r"[\r\n]?[\w+\-\.:\/\[\]]+(?:\([^\)]+\)){,3}(?:>|#) ?$"),
+    re.compile(r"\[\w+\@[\w\-\.]+(?: [^\]])\] ?[>#\$] ?$")
+]
+
+CLI_ERRORS_RE = [
+    re.compile(r"% ?Error"),
+    re.compile(r"% ?Bad secret"),
+    re.compile(r"invalid input", re.I),
+    re.compile(r"(?:incomplete|ambiguous) command", re.I),
+    re.compile(r"connection timed out", re.I),
+    re.compile(r"[^\r\n]+ not found", re.I),
+    re.compile(r"'[^']' +returned error code: ?\d+"),
+]
+
 def to_list(val):
     if isinstance(val, (list, tuple)):
         return list(val)
@@ -48,9 +63,9 @@ class Cli(object):
         username = self.module.params['username']
         password = self.module.params['password']
 
-        self.shell = Shell()
-
         try:
+            self.shell = Shell(kickstart=False, prompts_re=CLI_PROMPTS_RE,
+                    errors_re=CLI_ERRORS_RE)
             self.shell.open(host, port=port, username=username, password=password)
         except Exception, exc:
             msg = 'failed to connecto to %s:%s - %s' % (host, port, str(exc))
@@ -98,7 +113,10 @@ class NetworkModule(AnsibleModule):
         return responses
 
     def execute(self, commands, **kwargs):
-        return self.connection.send(commands)
+        try:
+            return self.connection.send(commands)
+        except ShellError, exc:
+            self.fail_json(msg=exc.message, command=exc.command)
 
     def disconnect(self):
         self.connection.close()