Gradle command issue

[renjfk]

There are two issues with Gradle package manager:

• Supposedly there is gradle_command option to override the command but PackageManage#$installed? checks it with by calling package_management_command which makes it useless.
• This is more of a general problem; LicenseFinder#command_exists? is not able to detect the command's existence when run from a different directory so I believe a Dir.chdir(project_path) should be performed there before the check.

[cf-gitbot]

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The labels on this github issue will be updated when the story is started.

[xtreme-shane-lattanzio]

Hey @renjfk ! Thanks for the issue. Since I do not have a setup to confirm this, it would be great to have a PR in with tests confirming that this fixes your issue. In the mean time I will just add a label to this.