network: clone connections from intramfs to persistent config
    
    In case of common connection ("Wired connection") being used for multiple
    devices in initramfs (which happens in case of ip=dhcp or no ip= specified) the
    connection was not used for persistent configuration of the devices and instead
    a default connection created by Anaconda was used.  Let's clone the "Wired
    connection" into the default connection created by Anaconda so that its
    properties (like default ipv6.addr-gen-mode or
    ipv4.dhcp-vendor-class-identifier) are preserved.
    
    Originally related to rhbz#1870692
    
    Resolves: rhbz#1910438
    
    Port of
    commit 05a80bb599d6e2ea694279ed4257a11a361b894d
    commit 71ca92aa4b09b5f186b8e1a8449ca7b4dae53e80
    commit 010e5fc8dc6de9fd7ecd20d4bcd0815dfa8a1555
    from master
    
    network: update docstring of clone_connection_async
    
    Also fix a minor style issue.