Add a .reviewboardrc option for --svn-prompt-password

Review Request #8336 — Created Aug. 18, 2016 and submitted — Latest diff uploaded

Information

RBTools
release-0.7.x
fb8e383...

Reviewers

.reviewboardrc now accepts the SVN_PROMPT_PASSWORD configuration key,
which maps to the --svn-prompt-password commandline option.

Set up a SVN repository with SVN_PROMPT_PASSWORD=True in the
.reviewboardrc. I was prompted for my password when running rbt post.