downgrade maven-deploy-plugin to 2.8.2

[xvrl]

also downgrades intall plugin to 2.5.2 since 3.0.0-M1 of install
plugin requires 3.0.0-M1 of deploy plugin according to releaes notes
https://blogs.apache.org/maven/entry/apache-maven-install-plugin-version

This is required becauses some components in our build environment are
still relying on deploy plugin 2.7.x, which prevents us from switching
to the new 3.0.x syntax for alt*DeploymentRepository which requires
removing the 'layout' component of the repo.
see https://maven.apache.org/plugins/maven-deploy-plugin/deploy-mojo.html

[ewencp]

waiting on green pr build, but otherwise lgtm

[xvrl]

@ewencp also downgrading install plugin out of abundance of caution due to release notes of both plugins saying their 3.0.0-M1 versions should only be used together.

[xvrl]

there are still unrelated downstream compilation errors that prevent us from testing any changes in this repo. cc @sdanduConf

[2020-06-05T06:10:45.658Z] [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project kafka-connect-storage-core: Compilation failure [2020-06-05T06:10:45.658Z] [ERROR] /home/jenkins/workspace/confluentinc-pr_common_PR-265/kafka-connect-storage-common-master/core/src/main/java/io/confluent/connect/storage/StorageSinkTestBase.java:[186,20] io.confluent.connect.storage.StorageSinkTestBase.MockSinkTaskContext is not abstract and does not override abstract method errantRecordReporter() in org.apache.kafka.connect.sink.SinkTaskContext