git-svn: use svn:global-ignores when creating .gitignores

Git-SVN does not currently use the svn:global-ignores property added in Subversion 1.8 when showing or creating .gitignore files. This causes Git-SVN to track files that are ignored by this directive in Subversion.

The following patches add svn:global-ignores to the list of public svn properties, and update git svn show-ignore and git svn create-ignore to use this attribute (as well as svn:ignore).

Alex Galvin (3):
git-svn: add public property svn:global-ignores
git-svn: use svn:global-ignores to create .gitignore
git-svn: mention svn:globalignores in help

 git-svn.perl    | 49 +++++++++++++++++++++++++++++++++----------------
 perl/Git/SVN.pm |  2 +-
 2 files changed, 34 insertions(+), 17 deletions(-)

base-commit: c2b3f2b3cdbf5ad9feb978dd367d77561a1271f7
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-1747%2Fav-gal%2Fgit-svn-global-ignores-v3
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-1747/av-gal/git-svn-global-ignores-v3
Pull-Request: https://github.com/git/git/pull/1747

Range-diff vs v2:

 1:  002750ea47a = 1:  002750ea47a git-svn: add public property `svn:global-ignores`
 2:  7735afb32af = 2:  7735afb32af git-svn: use `svn:global-ignores` to create .gitignore
 -:  ----------- > 3:  18dffbe992e git-svn: mention `svn:globalignores` in help

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