Strong name support for BLOB is no longer functional in ikvmc

[NightOwl888]

Since we fixed support for -keyfile in #46, using a BLOB transfer the certificate no longer functions. The documentation only shows 2 options for loading a strong name key:

1. -keyfile to load the key from the local file system.
2. -key to load the key from the system key container.

However, there appears to be another (undocumented?) option to load the key from a BLOB. Legacy scripts that load the BLOB approach to strong naming no longer function (example), which is a breaking change.

We should write some tests to ensure the -key option still functions as documented and to decide whether this BLOB approach is a "feature" or a "vulnerability".