GIRAPH-1172 Removed dependency com.google.code.findbugs:annotations

[jdasch]

Replaced com.google.code.findbugs:annotations:2.0.2 with com.github.stephenc.findbugs:findbugs-annotations:1.3.9-1 and com.google.code.findbugs:jsr305:2.0.2.

Had to remove a couple annotations that don't exist in the older version of the drop-in replacement. There is a newer version of com.github.stephenc.findbugs:findbugs-annotations, but it hasn't been uploaded to maven central for some reason. Moved usage of those annotations to the findbugs-exclude.xml file.

[adamkennedy]

FindBugs is BSD, there's been some threads in other places indicating this is true based on the LICENSE file, but the maven package was built incorrectly.

[jdasch]

I did come across this thread [1], which discusses that com.google.code.findbugs:jsr305 is BSD, and documents that the JSR-305's BSD license is included in the findbugs repo [2]. But the license for FindBugs source is LGPL [3].

Unfortunately, Giraph is using com.google.code.findbugs:annotations which includes both JSR-305 and some FindBugs annotations [4], [5] which do have LGPL headers in the source listings.

[1] findbugsproject/findbugs#128
[2] https:/findbugsproject/findbugs/blob/2.0.2/findbugs/licenses/LICENSE-jsr305.txt
[3] https:/findbugsproject/findbugs/blob/2.0.2/findbugs/licenses/LICENSE.txt
[4] https:/findbugsproject/findbugs/blob/2.0.2/findbugs/src/java/edu/umd/cs/findbugs/annotations/SuppressFBWarnings.java
[5] https:/findbugsproject/findbugs/blob/2.0.2/findbugs/src/java/edu/umd/cs/findbugs/annotations/SuppressWarnings.java