should handle the extension sync properly when it is within a repo

[hoatle]

for example with this config:

 - _id: "entry-iorad-app"
      path:
        lookup: workspace
        extension: iorad/teracy-dev-iorad-app # convert from https://github.com/iorad/iorad/tree/develop/dev-setup
      location:
        git:
          remote:
            origin: [email protected]:iorad/iorad.git
            branch: develop
      require_version: ">= 0.1.0-SNAPSHOT"
      enabled: true

• expected:

[TeracyDev::Location::GitSynch][INFO]: cd /Users/hoatle/iorad-dev-2/lib/../workspace/iorad && git checkout develop

iorad$ git remote -v
origin    [email protected]:iorad/iorad.git (fetch)
origin    [email protected]:iorad/iorad.git (push)

• actual:

[TeracyDev::Location::GitSynch][INFO]: cd /Users/hoatle/iorad-dev-2/lib/../workspace/iorad/teracy-dev-iorad-app && git checkout master
/Users/hoatle/iorad-dev-2/lib/teracy-dev/location/git_synch.rb:98:in `block in sync'

Branch 'master' set up to track remote branch 'master' from 'origin'.
Switched to a new branch 'master'
fatal: No such remote: branch

iorad$ git remote -v
branch    develop (fetch)
branch    develop (push)
origin    [email protected]:iorad/iorad.git (fetch)
origin    [email protected]:iorad/iorad.git (push)

[hoatle]

note: due to the wrong config, the $ git remote -v error is expected, we'll handle this case (validate later by #495)

       git:
          remote:
            origin: [email protected]:iorad/iorad.git
            branch: develop

should be:

       git:
          remote:
            origin: [email protected]:iorad/iorad.git
          branch: develop