Use ar to determine the control file's actual name

[sleepdeprecation]

Not all deb packages use gzip for compressing their files, and gzip is
no longer the default (Debian's documentation says xz is used by default
now), because of this Deb::S3::Packages#extract_control fails on newly
built deb packages.

This change uses ar to determine the actual control file name before
attempting to do operations on it.

Confirmed that this worked

# old output
>> Retrieving existing manifests
>> Examining package file bash-static_4.4.18-2ubuntu1journera1_amd64.deb
Failed to find control data in .deb with ar, trying tar.
tar: control.tar.gz: Not found in archive
tar: Error exit delayed from previous errors.
Traceback (most recent call last):
        14: from /usr/local/bin/deb-s3:23:in `<main>'
        13: from /usr/local/bin/deb-s3:23:in `load'
        12: from /usr/local/lib/ruby/gems/2.5.0/gems/deb-s3-0.10.0/bin/deb-s3:9:in `<top (required)>'
        11: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.19.4/lib/thor/base.rb:444:in `start'
        10: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.19.4/lib/thor.rb:369:in `dispatch'
         9: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.19.4/lib/thor/invocation.rb:126:in `invoke_command'
         8: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.19.4/lib/thor/command.rb:27:in `run'
         7: from /usr/local/lib/ruby/gems/2.5.0/gems/deb-s3-0.10.0/lib/deb/s3/cli.rb:188:in `upload'
         6: from /usr/local/lib/ruby/gems/2.5.0/gems/deb-s3-0.10.0/lib/deb/s3/cli.rb:188:in `each'
         5: from /usr/local/lib/ruby/gems/2.5.0/gems/deb-s3-0.10.0/lib/deb/s3/cli.rb:190:in `block in upload'
         4: from /usr/local/lib/ruby/gems/2.5.0/gems/deb-s3-0.10.0/lib/deb/s3/package.rb:46:in `parse_file'
         3: from /usr/local/lib/ruby/gems/2.5.0/gems/deb-s3-0.10.0/lib/deb/s3/package.rb:74:in `extract_control'
         2: from /usr/local/Cellar/ruby/2.5.1/lib/ruby/2.5.0/tmpdir.rb:89:in `mktmpdir'
         1: from /usr/local/lib/ruby/gems/2.5.0/gems/deb-s3-0.10.0/lib/deb/s3/package.rb:76:in `block in extract_control'
/usr/local/lib/ruby/gems/2.5.0/gems/deb-s3-0.10.0/lib/deb/s3/package.rb:76:in `read': No such file or directory @ rb_sysopen - /var/folders/17/77jz89_9663076r0nlw91ny80000gn/T/d20180924-81675-fahdb1/control (Errno::ENOENT)

# new output
>> Retrieving existing manifests
>> Examining package file bash-builtins_4.4.18-2ubuntu1journera1_amd64.deb
>> Examining package file bash-doc_4.4.18-2ubuntu1journera1_all.deb
>> Examining package file bash-static_4.4.18-2ubuntu1journera1_amd64.deb
>> Examining package file bash_4.4.18-2ubuntu1journera1_amd64.deb
>> Uploading packages and new manifests to S3

[sleepdeprecation]

@krobertson can you please look at this? it's preventing other people on my team from uploading new packages to our repo.

[lzecca78]

are there any news about this issue?