defaults write /Users/Shared/.SeedEnrollment

sh-3.2$ defaults read /Users/Shared/.SeedEnrollment.plist
{
    SeedProgram = DeveloperSeed;
}
sh-3.2$ sudo rm /Users/Shared/.SeedEnrollment.plist
Password:
sh-3.2$ defaults write /Users/Shared/.SeedEnrollment SeedProgram DeveloperSeed
sh-3.2$ defaults read /Users/Shared/.SeedEnrollment.plist
{
    SeedProgram = DeveloperSeed;
}
sh-3.2$ sw_vers
ProductName:	Mac OS X
ProductVersion:	10.13
BuildVersion:	17A264c
sh-3.2$