Interpolate correctly resource paths in maven project inside maven server implementation

[vzhukovs]

Sometimes after updating properties of maven based projects we may have in project attributes absolute paths:

{
    "links": [{
        "href": "http://.../api/project/AddFilesToIndex_anym",
        "parameters": [],
        "rel": "update project",
        "method": "PUT",
        "produces": "application/json",
        "consumes": "application/json"
    }, {
        "href": "http://.../api/project/children/AddFilesToIndex_anym",
        "parameters": [],
        "rel": "children",
        "method": "GET",
        "produces": "application/json"
    }, {
        "href": "http://.../api/project/tree/AddFilesToIndex_anym",
        "parameters": [],
        "rel": "tree",
        "method": "GET",
        "produces": "application/json"
    }, {
        "href": "http://.../api/project/AddFilesToIndex_anym",
        "parameters": [],
        "rel": "delete",
        "method": "DELETE"
    }],
    "name": "AddFilesToIndex_anym",
    "attributes": {
        "maven.artifactId": ["artifactId"],
        "maven.parent.version": ["unknown"],
        "maven.test.source.folder": ["/projects/AddFilesToIndex_anym/src/test/java"],
        "maven.version": ["1.0-SNAPSHOT"],
        "maven.parent.groupId": ["unknown"],
        "languageVersion": ["1.8.0_45"],
        "language": ["java"],
        "maven.groupId": ["groupId"],
        "maven.packaging": ["war"],
        "containsJavaFiles": ["true"],
        "java.source.folder": ["/projects/AddFilesToIndex_anym/src/main/java"],
        "maven.resource.folder": ["/projects/AddFilesToIndex_anym/src/main/resources"],
        "vcs.provider.name": ["git"],
        "git.current.branch.name": ["master"],
        "maven.parent.artifactId": ["unknown"]
    },
    "type": "maven",
    "source": {
        "parameters": {}
    },
    "path": "/AddFilesToIndex_anym",
    "problems": [{
        "message": "Value for attribute java:java.output.folder:java.output.folder is not initialized, caused by: Unknown attribute java.output.folder",
        "code": 13
    }],
    "mixins": ["git"]
}

Method org.eclipse.che.maven.server.MavenServerImpl#resolveProject should be refactored to return relative paths instead of absolute.