Fix boto prefix configuration value (#3832)
Fix boto prefix configuration value (#3832)

The value we use in -prod is the empty string. This fixes a bad value that came
about from the way I pulled the -prod configuration to generate the
configuration files.
AdrianGaudebert/socorro,lonnen/socorro,Tayamarn/socorro,adngdb/socorro,Tayamarn/socorro,Tayamarn/socorro,adngdb/socorro,AdrianGaudebert/socorro,mozilla/socorro,m8ttyB/socorro,Tayamarn/socorro,m8ttyB/socorro,m8ttyB/socorro,AdrianGaudebert/socorro,adngdb/socorro,lonnen/socorro,mozilla/socorro,AdrianGaudebert/socorro,adngdb/socorro,lonnen/socorro,lonnen/socorro,mozilla/socorro,Tayamarn/socorro,mozilla/socorro,m8ttyB/socorro,adngdb/socorro,AdrianGaudebert/socorro,m8ttyB/socorro,mozilla/socorro,AdrianGaudebert/socorro,Tayamarn/socorro,m8ttyB/socorro,mozilla/socorro,adngdb/socorro