Fix parsing of node public keys in manifest CLI:

The existing code attempts to validate the provided node public key
using a function that assumes that the encoded public key is for an
account. This causes the parsing to fail.

This commit fixes #3317 by letting the caller specify the type of
the public key being checked.

src/ripple/app/misc/NetworkOPs.cpp

@@ -1915,6 +1915,7 @@ NetworkOPsImp::pubManifest(Manifest const& mo)
         jvObj[jss::master_signature] = strHex(mo.getMasterSignature());
         if (!mo.domain.empty())
             jvObj[jss::domain] = mo.domain;
+        jvObj[jss::manifest] = strHex(mo.serialized);
 
         for (auto i = mStreamMaps[sManifests].begin();
              i != mStreamMaps[sManifests].end();)