Code formatting PR #165 and enabling multi-dex

[charithag]

Purpose

Refactor code in PR #165 and add multi dex support

Goals

Improve code quality and enable multi dex support

Approach

Since Android L the device owner can install/uninstall packages using the PackageInstaller API which is utilized in this commit.

User stories

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Release note

Allow silent app install/uninstall if agent is device owner

Documentation

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Training

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Certification

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Marketing

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Automation tests

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Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes
• Ran FindSecurityBugs plugin and verified report? yes
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? yes

Samples

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Related PRs

https://github.com/wso2/cdmf-agent-android/pull/165

Migrations (if applicable)

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Test environment

JDK 1.8 Update 162 Android Studio 3.0.1 Tested on android 7.0

Learning

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