Implement Stage 2 BLIS update - copy application files

[hakiatalov]

As the BLIS-NG System Update
I want to move staged BLIS update files into a release directory
So that the update process may reference the lates version BLIS

• Move the staging directory into \BLIS\releases\
• Rename the moved staging directory to the name of the version (e.g. v3.8.1)
• If the release version contains a server\ directory, move server\ into the root directory, replacing the existing one. Prior to replacing server\, back up the existing server\ directory.

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AC

1. Given a BLIS update artifact, When the Stage 2 update process begins, Then the staged release files are moved into the \BLIS\releases\ directory.
2. Given the BLIS update artifact contains a, updated server\ directory, When the Stage 2 update is in progress, Then the new server version replaces the existing one.
3. Given a new server version, When the old server version is replaced, then a backup of the old server version is retained to support rollbacks.