ng update --next should deduplicate angular packages and just show core

[StephenFluin]

Versions

Angular CLI: 6.0.0-rc.2
Node: 9.2.0
OS: linux x64
Angular: 6.0.0-rc.3
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router

@angular/cli: 6.0.0-rc.2
@angular-devkit/architect: 0.5.4
@ngtools/json-schema: 1.2.0
@schematics/update: 0.5.4
typescript: 2.7.2
webpack: error

Repro steps

ng update --next

Observed behavior

ng update --next
    We analyzed your package.json, there are some packages to update:
    
      Name                               Version                    Command to update
     ---------------------------------------------------------------------------------------------------------
      @angular/animations                5.2.9 -> 6.0.0-rc.3        ng update @angular/animations
      @angular/common                    5.2.9 -> 6.0.0-rc.3        ng update @angular/common
      @angular/compiler                  5.2.9 -> 6.0.0-rc.3        ng update @angular/compiler
      @angular/compiler-cli              5.2.9 -> 6.0.0-rc.3        ng update @angular/compiler-cli
      @angular/core                      5.2.9 -> 6.0.0-rc.3        ng update @angular/core
      @angular/forms                     5.2.9 -> 6.0.0-rc.3        ng update @angular/forms
      @angular/http                      5.2.9 -> 6.0.0-rc.3        ng update @angular/http
      @angular/language-service          5.2.9 -> 6.0.0-rc.3        ng update @angular/language-service
      @angular/platform-browser          5.2.9 -> 6.0.0-rc.3        ng update @angular/platform-browser
      @angular/platform-browser-dynamic  5.2.9 -> 6.0.0-rc.3        ng update @angular/platform-browser-dynamic
      @angular/router                    5.2.9 -> 6.0.0-rc.3        ng update @angular/router
      typescript                         2.5.3 -> 2.9.0-dev.20180409  npm install typescript
    
    
    There might be additional packages that are outdated.
    Or run ng update --all to try to update all at the same time.
    
Nothing to be done.

Desired behavior

ng update should tell me what to do next, and take into account its own context.

if ng update @angular/core updates all of these synced packages, then all should be grouped. We should be treating them all like one thing unless there's an exception and one is out of date. We want to help people think about them as a single unit.

[hansl]

We need to show only the first package name of the group.

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