When clearning or appending to a repeated value, both the "Clearing..."
/ "Adding..." line and the "Set..." line were shown. However, this is
misleading as the only performed operation is the clearing / appending.
We fix this by directly returning from the function in case of clearing
/ appending.
When setting the whole configuration via --configure, list types like
adminKey need special handling. Previously this failed as a list cannot
be appended to a list. The new code adds dedicated logic to replace the
repeated value when passing a list. Also, all items of that list are
converted into the correct (typed) form before setting them.
By passing a typed value we can conserve the type information to later
use that to convert it back into the correct protobuf type. The type
conversion is now done inside setPref.
When getting config values of type bytes or list (technically a protobuf
repeated container type), these were directly printed on the output.
However, the retrieved values could not be set by --set again, as the
format was different (e.g. python string representation of bytes vs.
base64 prefixed and encoded as expected by --set).
We fix this by adding a toStr utility function (similar to the fromStr)
function to convert byte types correctly to the base64 representation.
Further, we check if the type is repeated and apply this operation to
all values.
We add a local helper function to print a single setting. This is a
preparation to correctly print non-trivial types. The existing code
in getPref is ported over to use that function. By that, the output
of "wholeField" is changed slightly to always print the full path for
each setting (e.g. "security.serialEnabled" instead of
"security:\nserialEnabled"). This improves support for grepping on the
output.
