Use 'ensure_packages" to prevent duplicate packages

[jurim76]

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For install class, always use "ensure_packages" function to prevent duplicate package error - "Error: Could not retrieve catalog from remote server: Error 400 on SERVER: Duplicate declaration: Package[python-dev] is already declared; "

Old if $pythondev { package { 'python-dev': ensure => $dev_ensure, name => $pythondev, } }

New if $pythondev { ensure_packages( 'python-dev', { ensure => $dev_ensure, name => $pythondev, } ) } etc