Output changelog in report, TUI and JSON for Ubuntu/Debian/CentOS

[kotakanbe]

What did you implement:

In case of updating vulnerable package, it is helpful to see a changelog information.
The output change log includes only the difference between the currently installed version and candidate version.

Closes #341

NOTE
Amazon/RHEL/FreeBSD will be implemented after abolition of prepare subcommand. #365

TODO

• CentOS
• Ubuntu/Raspbian
• Debian
• TUI
• Email
• Stdout
• LocalFile
• gzip
• Output a detailed information to a TUI / Reporting / JSON package that does not have Changelog or failed version match in Changelog
• README

How did you implement it:

How can we verify it:

Todos:

You don't have to satisfy all of the following.

• Write tests
• Write documentation
• Check that there aren't other open pull requests for the same issue/feature
• Format your source code by make fmt
• Pass the test by make test
• Provide verification config / commands
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: NO
Is it a breaking change?: YES
remove cache.db

[kotakanbe]

with -format-full-text

...snip...

CVE-2017-5336
-------------
Score           ?
NVD             https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-5336
CVE Details     http://www.cvedetails.com/cve/CVE-2017-5336
Ubuntu-CVE      http://people.ubuntu.com/~ubuntu-security/cve/CVE-2017-5336
Package         libgnutls-openssl27-3.4.10-4ubuntu1.1 -> libgnutls-openssl27-3.4.10-4ubuntu1.2
                libgnutls30-3.4.10-4ubuntu1.1 -> libgnutls30-3.4.10-4ubuntu1.2
Confidence      95 / ChangelogExactMatch

CVE-2017-5337
-------------
Score           ?
NVD             https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-5337
CVE Details     http://www.cvedetails.com/cve/CVE-2017-5337
Ubuntu-CVE      http://people.ubuntu.com/~ubuntu-security/cve/CVE-2017-5337
Package         libgnutls-openssl27-3.4.10-4ubuntu1.1 -> libgnutls-openssl27-3.4.10-4ubuntu1.2
                libgnutls30-3.4.10-4ubuntu1.1 -> libgnutls30-3.4.10-4ubuntu1.2
Confidence      95 / ChangelogExactMatch

....snip...

apt-1.2.6 -> apt-1.2.19
-----------------------
apt (1.2.19) xenial; urgency=medium

  * https: Quote path in URL before passing it to curl (LP: #1651923)

 -- Julian Andres Klode <juliank@ubuntu.com>  Tue, 17 Jan 2017 15:48:51 +0100

apt (1.2.18) xenial; urgency=high

  * SECURITY UPDATE: gpgv: Check for errors when splitting files (CVE-2016-1252)
    Thanks to Jann Horn, Google Project Zero for reporting the issue
    (LP: #1647467)
  * gpgv: Flush the files before checking for errors

 -- Julian Andres Klode <juliank@ubuntu.com>  Thu, 08 Dec 2016 15:28:08 +0100

...snip...