chore: switch to the standard Incubator DISCLAIMER instead of current…

… work-in-progress version (#1707)

Now there is no licensing issue, thus I think we could switch to the standard
Incubator DISCLAIMER.

.licenserc.yaml

@@ -25,7 +25,7 @@ header:
     - '**/*.csv'
     - '**/*.json'
     # All the type of licenses of this project should be added to LICENSE.
-    - 'DISCLAIMER-WIP'
+    - 'DISCLAIMER'
     - 'LICENSE'
     - 'NOTICE'
     # Change log.

.rat-excludes

@@ -25,5 +25,5 @@ argh.h
 linenoise/*
 sds/*
 .*patch
-DISCLAIMER-WIP
-.rat-excludes
+DISCLAIMER
+.rat-excludes

DISCLAIMER

@@ -0,0 +1,10 @@
+Apache Pegasus (incubating) is an effort undergoing incubation at The Apache
+Software Foundation (ASF), sponsored by the Apache Incubator PMC.
+
+Incubation is required of all newly accepted projects until a further review
+indicates that the infrastructure, communications, and decision making process
+have stabilized in a manner consistent with other successful ASF projects.
+
+While incubation status is not necessarily a reflection of the completeness
+or stability of the code, it does indicate that the project has yet to be
+fully endorsed by the ASF.