[ixpmanager] IXP V4 installation script problem

[钱艳敏]

Hello there:
    I used the ubuntu16.04 64bit system discovery script during the test
script of the IXP V4 to find that the lack of installing curl caused the
script to fail and hope to solve it.
Reference document URL：
https://github.com/inex/IXP-Manager/tree/master/tools/installers

thank you very much!
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