I don't think this file is there in crxde as a node. It could be a java servlet that is executed when you invoke this url. I know package manager code is there in com.adobe.granite.crx-packagemgr-1.x.xx.jar, this should be there in that package but I am not sure. It looks that call to this jsp invokes following classes, but I am not sure where this file is mapped to servlet
com.day.crx.security.token.impl.TokenAuthenticationHandler
org.apache.sling.auth.core.impl.SlingAuthenticator
org.apache.jackrabbit.core.security.authentication.AbstractLoginModule
org.apache.jackrabbit.core.securityauthentication.DefaultLoginModule
org.apache.jackrabbit.core.security.authentication.AbstractLoginModule