[REEF-1829] pom.xml fix: Apache license checker complains about files in .vs/ directory
[REEF-1829] pom.xml fix: Apache license checker complains about files in .vs/ directory

Add `**/.vs/**` to `exclude` section of the `apache-rat-plugin` in root `pom.xml`

JIRA: [REEF-1829](https://issues.apache.org/jira/browse/REEF-1829)

Closes #1330

dongjoon-hyun/reef,jwang98052/incubator-reef,shravanmn/reef,dougmsft/reef,dougmsft/reef,dongjoon-hyun/incubator-reef,dongjoon-hyun/reef,dougmsft/reef,markusweimer/incubator-reef,markusweimer/reef,motus/reef,jwang98052/reef,dongjoon-hyun/incubator-reef,motus/reef,dongjoon-hyun/reef,shravanmn/reef,apache/reef,dongjoon-hyun/reef,apache/reef,dongjoon-hyun/reef,dougmsft/reef,apache/incubator-reef,jwang98052/reef,markusweimer/reef,dongjoon-hyun/incubator-reef,jwang98052/reef,dougmsft/reef,markusweimer/reef,apache/reef,shravanmn/reef,jwang98052/incubator-reef,singlis/reef,shravanmn/reef,apache/incubator-reef,markusweimer/incubator-reef,apache/incubator-reef,jwang98052/reef,markusweimer/incubator-reef,motus/reef,singlis/reef,dongjoon-hyun/incubator-reef,singlis/reef,jwang98052/incubator-reef,shravanmn/reef,apache/reef,jwang98052/incubator-reef,jwang98052/incubator-reef,motus/reef,dongjoon-hyun/reef,singlis/reef,dougmsft/reef,apache/incubator-reef,singlis/reef,markusweimer/incubator-reef,dongjoon-hyun/incubator-reef,markusweimer/reef,markusweimer/incubator-reef,apache/reef,apache/incubator-reef,apache/incubator-reef,motus/reef,jwang98052/incubator-reef,jwang98052/reef,dongjoon-hyun/reef,apache/reef,singlis/reef,motus/reef,shravanmn/reef,jwang98052/incubator-reef,motus/reef,markusweimer/incubator-reef,dongjoon-hyun/incubator-reef,apache/reef,singlis/reef,markusweimer/reef,dougmsft/reef,dongjoon-hyun/incubator-reef,markusweimer/incubator-reef,jwang98052/reef,shravanmn/reef,jwang98052/reef,apache/incubator-reef,markusweimer/reef,markusweimer/reef