[Rust Server] Fix #5906 (yaml with path parameter error)

[paladinzh]

#5906

Modification list

1. Fix generated code with Rust 1.39+ issue

help: use dyn: dyn Future<Item=CallbackWithHeaderPostResponse, Error=ApiError> + Send
error: trait objects without an explicit dyn are deprecated
--> output/openapi-v3/examples/server/server.rs:137:29
|
137 | context: &C) -> Box<Future<Item=CallbackWithHeaderPostResponse, Error=ApiError> + Send>
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use dyn: dyn Future<Item=CallbackWithHeaderPostResponse, Error=ApiError> + Send
|
= note: -D bare-trait-objects implied by -D warnings
error: trait objects without an explicit dyn are deprecated
--> output/openapi-v3/examples/server/server.rs:147:29
|
147 | context: &C) -> Box<Future<Item=ComplexQueryParamGetResponse, Error=ApiError> + Send>
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use dyn: dyn Future<Item=ComplexQueryParamGetResponse, Error=ApiError> + Send

2. Generate Rust code "repoId", Not "Repoid", and compile error.
   regex::Regex::new(r"^/v2/repos/(?P[^/?#]*)$")

3. Modify default serverPort from 80 to var "serverPort" with 8080, 8080 is more easy for test.

Rust Server Technical Committee

• @frol
• @farcaller
• @bjgill

PR checklist

• Read the contribution guidelines.
• If contributing template-only or documentation-only changes which will change sample output, build the project before.
• Run the shell script(s) under ./bin/ (or Windows batch scripts under.\bin\windows) to update Petstore samples related to your fix. This is important, as CI jobs will verify all generator outputs of your HEAD commit, and these must match the expectations made by your contribution. You only need to run ./bin/{LANG}-petstore.sh, ./bin/openapi3/{LANG}-petstore.sh if updating the code or mustache templates for a language ({LANG}) (e.g. php, ruby, python, etc).
• Copy the technical committee to review the pull request if your PR is targeting a particular programming language.
• File the PR against the correct branch: master, 4.3.x, 5.0.x. Default: master.

[richardwhiuk]

Looks good - but can you clarify what bug you are fix by changing the regex?

[paladinzh]

Looks good - but can you clarify what bug you are fix by changing the regex?
See #5906