Update Poetry package firewall command and output (#295)

This change updates the command to use to add the `phylum` source repo
so that it makes use of the `--priority primary` option, which will be
required in a future release of Poetry and makes it more explicit now.
The output when **all** versions of a package are blocked is also
updated to match the current output text when this happens.

Author: maxrake

docs/package_firewall/pypi.md

@@ -61,7 +61,7 @@ With Poetry, the source URL can be configured per-project in the
 directory:
 
 ```sh
-poetry source add phylum https://pypi.phylum.io/simple/
+poetry source add --priority primary phylum https://pypi.phylum.io/simple/
 poetry config http-basic.phylum "<PHYLUM_ORG>%2F<PHYLUM_GROUP>" "<PHYLUM_API_KEY>"
 ```
 
@@ -79,7 +79,7 @@ If **all** versions of a package are blocked, it will be explicitly pointed out
 as having failed analysis:
 
 ```text
-424 Client Error: "malicious" failed Phylum analysis for url: https://pypi.phylum.io/simple/malicious/
+424 Client Error: Failed Dependency for url: https://pypi.phylum.io/simple/malicious/
 ```
 
 If a version range is accepted by the manifest, the package manager will