[MSHADE-372] Shade plugin dependencies not resolvable from snapshot repository

**[Michael Heuer](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=heuermh)** opened **[MSHADE-372](https://issues.apache.org/jira/browse/MSHADE-372?redirect=false)** and commented

Given

```xml

org.apache.maven.plugins
maven-shade-plugin


org.bdgenomics.adam
adam-shade-spark2_${scala.version.prefix}
${adam.version}


```

With a snapshot version (e.g. 0.32.0-SNAPSHOT) resolution of this dependency appears to be looking in the wrong snapshot repository

```
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-shade-plugin:3.2.0:shade (default) on project cannoli-assembly-spark2_2.12: Execution default of goal org.apache.maven.plugins:maven-shade-plugin:3.2.0:shade failed: Plugin org.apache.maven.plugins:maven-shade-plugin:3.2.0 or one of its dependencies could not be resolved: Failure to find org.bdgenomics.adam:adam-shade-spark2_2.12:jar:0.32.0-SNAPSHOT in https://repository.apache.org/snapshots was cached in the local repository, resolution will not be reattempted until the update interval of apache.snapshots has elapsed or updates are forced -> [Help 1]
```

org.bdgenomics.adam:adam-shade-spark2_${scala.version.prefix}:0.32.0-SNAPSHOT is in fact present in the Sonatype snapshots repository

https://oss.sonatype.org/content/repositories/snapshots/org/bdgenomics/adam/adam-shade-spark2_2.12/0.32.0-SNAPSHOT/

This snapshot repository is included in our parent pom via oss-parent

```xml

org.sonatype.oss
oss-parent
9

```

---

**Affects:** 3.2.0

Reproduce the maven-shade-plugin:3.2.0:shade failure with the XML plugin dependency example and a 0.32.0-SNAPSHOT version. Inspect how the parent POM's oss-parent snapshot repository is considered for plugin dependencies; done means the dependency resolves from the Sonatype snapshots repository rather than the wrong snapshot repository.

Written by the indexing model from the issue text.