Incorrect messages about conflicting local server launchs

- Steps to reproduce:
1. Create two HelloWorld projects, `Alice` and `Bob`.
2. Select `Alice`. _Run As_ > _App Engine_.
3. Select `Bob`. _Run As_ > _Run on Server_. Select _Manually define a new server_. Change _Server Port_ to, e.g., 8089. Click _Finish_.


The message mentions about the admin port, but it's basically irrelevant with dev appserver1. The port 8000 is also out of place. It's not true either that the storage path is conflicting, because AFAIK, for dev appsever1, the storage path will be inside `WEB-INF` of the deploy directory. In other words, there is no conflicting resources for dev appserver1, and we should be able to run `Alice` and `Bob` simultaneously. Is this correct @patflynn?

Note that, however, this may not necessarily be a regression in the sense that, previously with dev appserver2, we were not able to run `Alice` and `Bob` anyway. (There was no way for users to change the storage path in our Eclipse plugin.)