Added info about restricted chars in bulk_api_password

[mwieczorek]

According to https://github.com/cloudfoundry/cf-release/issues/992#issuecomment-228824498 some chars in BULK_API_PASSWORD are restricted. This PR can save some time for resolving deployment errors (I encountered this problem today)

[cfdreddbot]

Hey mwieczorek!

Thanks for submitting this pull request!

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[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this:

https://www.pivotaltracker.com/story/show/144346285

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

[mwieczorek]

CLA sent to contributors@cloudfoundry.com

[cfdreddbot]

Hey mwieczorek!

Thanks for submitting this pull request! I'm here to inform the recipients of the pull request that you and the commit authors have already signed the CLA.

[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this:

https://www.pivotaltracker.com/story/show/144605701

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

[animatedmax]

Thank you mwieczorek