TT#23277 change lnp type from enum to string

+ anticipate warnings in .down, if string values
  other than "fixed" or "mobile" are present

+ .down scripts now dropped, no rollbacks supported.

Change-Id: I82f4b6d814892586613da3e670e8e50b50ae54b3

db_scripts/diff/15364_not_replicated.up

@@ -0,0 +1,5 @@
+SET sql_log_bin=0;
+use accounting;
+
+alter table cdr change column source_lnp_type source_lnp_type varchar(255) default null,
+  change column destination_lnp_type destination_lnp_type varchar(255) default null;

db_scripts/diff/15365.up

@@ -0,0 +1,3 @@
+use billing;
+
+alter table lnp_numbers change column type type varchar(255) default null;