Update JGit to 4.9.1.201712030800-r

Change-Id: If7a38a2a02b614987e250521716f972d7bd0a63d
diff --git a/lib/jgit/jgit.bzl b/lib/jgit/jgit.bzl
index 27f53c7..53f749c 100644
--- a/lib/jgit/jgit.bzl
+++ b/lib/jgit/jgit.bzl
@@ -1,12 +1,12 @@
 load("//tools/bzl:maven_jar.bzl", "GERRIT", "MAVEN_LOCAL", "MAVEN_CENTRAL", "maven_jar")
 
-_JGIT_VERS = "4.9.0.201710071750-r.8-g678c99c05"
+_JGIT_VERS = "4.9.1.201712030800-r"
 
-_DOC_VERS = "4.9.0.201710071750-r"  # Set to _JGIT_VERS unless using a snapshot
+_DOC_VERS = _JGIT_VERS  # Set to _JGIT_VERS unless using a snapshot
 
 JGIT_DOC_URL = "http://download.eclipse.org/jgit/site/" + _DOC_VERS + "/apidocs"
 
-_JGIT_REPO = GERRIT  # Leave here even if set to MAVEN_CENTRAL.
+_JGIT_REPO = MAVEN_CENTRAL  # Leave here even if set to MAVEN_CENTRAL.
 
 # set this to use a local version.
 # "/home/<user>/projects/jgit"
@@ -26,28 +26,28 @@
         name = "jgit_lib",
         artifact = "org.eclipse.jgit:org.eclipse.jgit:" + _JGIT_VERS,
         repository = _JGIT_REPO,
-        sha1 = "845fcaabaaf84f0924f78971def3adc962d3a69e",
-        src_sha1 = "8cc0627939d1bcd8fb313fd6bed03edfecc5011f",
+        sha1 = "e8ab33771a89682e80596854a6739ab8889ecdeb",
+        src_sha1 = "f2cdb9f8f87a37b5611c0750db2bc570736533da",
         unsign = True,
     )
     maven_jar(
         name = "jgit_servlet",
         artifact = "org.eclipse.jgit:org.eclipse.jgit.http.server:" + _JGIT_VERS,
         repository = _JGIT_REPO,
-        sha1 = "a0cb65ef0d9db387b010337b44ac4710be52b21e",
+        sha1 = "6ecb5bd14f45fe07995074613c9255a3447623b2",
         unsign = True,
     )
     maven_jar(
         name = "jgit_archive",
         artifact = "org.eclipse.jgit:org.eclipse.jgit.archive:" + _JGIT_VERS,
         repository = _JGIT_REPO,
-        sha1 = "32c85ea349d19a0129d43ceda021a3bdd41a8242",
+        sha1 = "87002ceb9f127e1220f854b12a53b9639404b926",
     )
     maven_jar(
         name = "jgit_junit",
         artifact = "org.eclipse.jgit:org.eclipse.jgit.junit:" + _JGIT_VERS,
         repository = _JGIT_REPO,
-        sha1 = "549c3b338d66c2f8575394252a39e69d7fe71969",
+        sha1 = "89a9789155dc44200a15adc3544069b6cd7196a4",
         unsign = True,
     )