Make nios_txt_record use text field for object lookup (#67120)

Up until now, nios_txt_record assumed that the name and view
parameters uniquely described a TXT record. What this meant is that it
was impossible to have more than one TXT record with a certain name.

Changes in this commit expands the set of parameters that uniquely
identify the TXT record with a text field.

lib/ansible/modules/net_tools/nios/nios_txt_record.py

@@ -106,7 +106,7 @@ def main():
     ib_spec = dict(
         name=dict(required=True, ib_req=True),
         view=dict(default='default', aliases=['dns_view'], ib_req=True),
-        text=dict(type='str'),
+        text=dict(type='str', ib_req=True),
         ttl=dict(type='int'),
         extattrs=dict(type='dict'),
         comment=dict(),