Jira API Communication Add Proxy

[cmenapace]

We have recently migrated to Jira Cloud environment, for the Icinga Integration to work, we needed to connect to the Jira Cloud, through a Proxy Server, because direct Access was restricted.
I have implemented a small change, to configure a Proxy Server, in the Icinga Jira API Configuration

fix feture request: #135

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[cla-bot]

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[cla-bot]

Thank you for your pull request. Before we can look at it, you'll need to sign a Contributor License Agreement (CLA).

Please follow instructions at https://icinga.com/company/contributor-agreement to sign the CLA.

After that, please reply here with a comment and we'll verify.

Contributors that have not signed yet: @cmenapace

• If you've already signed a CLA, it's possible we don't have your GitHub username or you're using a different email address. Please contact us if you think this is the case.

• If you signed the CLA as a corporation, your GitHub username may not have been submitted to us. Please reach out to the responsible person in your organization.

[cla-bot]

Thank you for your pull request. Before we can look at it, you'll need to sign a Contributor License Agreement (CLA).

Please follow instructions at https://icinga.com/company/contributor-agreement to sign the CLA.

After that, please reply here with a comment and we'll verify.

Contributors that have not signed yet: @cmenapace

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[cmenapace]

I have now signed the Contributor License Agreement (CLA)

[bobapple]

@cla-bot check