* uplink: Mark encryption key config field for setup
Set the "setup" property to the `EncryptionConfig.EncrptionKey` for
avoiding to save it in the configuration file.
This field is only meant for using in the command line parameters which
need to use a different encryption key than the one present in the key
file or use it when there is not set any encryption key file path.
* cmd/uplink: Setup non-interactive accept enc key
Change the uplink CLI setup command non-interactive to save the
encryption key into a file when it's passed through the flag
--enc.encryption-key
Previous to this change it wasn't possible to create an key file despite
of that the flag was provided, so it was useless on the setup command.
* cmd/uplink: Reuse logic to read pwd from terminal
Reuse the logic which is already implemented in the pkg/cfgstruct for
reading a password from the terminal on interactive mode, rather than
duplicating it in the setup command.
* cmd/gateway: Use encryption key file flags
The cmd/gateway was still using the `enc.key` configuration field which
doesn't exist anymore and its setup command wasn't using the
`enc.key-filepath` with combination of the `enc.encryption-key` for
generating a file with the encryption key.
This commit update the cmd/gateway appropriately and move to the uplink
package the function used by cmd/uplink to save the encryption key for
allowing to also be used by the cmd/gateway without duplicating the
logic.
* cmd/storj-sim: Adapt gateway config cmd changes
Adapt the cmd/storj-sim to correctly pass the parameters to the
cmd/gateway setup and run command.
* scripts: Don't pass the --enc.encryption-key flag
uplink configuration has changed to only support the
`--enc.encryption-key` flag for setup commands and consequently the
cmd/uplink and cmd/gateway don't accept this flag over other commands,
hence the test for the uplink had to be updated for no passing the
flag on the multiples calls that the test do to cmd/uplink.
* uplink: Remove func which aren't useful anymore
Remove the function which allows to user or load an encryption key
because it isn't needed anymore since the `--enc.encryption-key` flag is
only available for the setup command.
Consequently remove its usage from cmd/uplink and cmd/gateway, because
such flag will always be empty because in case that's passed Cobra will
return an error due to a "unknown flag".
