Fix plugin provider names to conform with release train requirement

According to release train requirements [1] the provider name for all
artifacts of Eclipse projects is "Eclipse <project name>".

[1] http://wiki.eclipse.org/Development_Resources/HOWTO/Release_Reviews#Checklist

Change-Id: I8445070d1d96896d378bfc49ed062a5e7e0f201f
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.console/plugin.properties

@@ -1,2 +1,2 @@
 plugin_name=JGit Console User Interface
-provider_name=Eclipse.org
+provider_name=Eclipse JGit

org.eclipse.jgit.http.server/plugin.properties

@@ -1,2 +1,2 @@
 plugin_name=JGit HTTP Server
-provider_name=Eclipse.org
+provider_name=Eclipse JGit

org.eclipse.jgit.http.test/plugin.properties

@@ -1,2 +1,2 @@
 plugin_name=JGit HTTP Tests
-provider_name=Eclipse.org
+provider_name=Eclipse JGit

org.eclipse.jgit.junit.http/plugin.properties

@@ -1,2 +1,2 @@
 plugin_name=JGit JUnit Http Utility Classes
-provider_name=Eclipse.org
+provider_name=Eclipse JGit

org.eclipse.jgit.junit/plugin.properties

@@ -1,2 +1,2 @@
 plugin_name=JGit JUnit Utility Classes
-provider_name=Eclipse.org
+provider_name=Eclipse JGit

org.eclipse.jgit.pgm.test/plugin.properties

@@ -1,2 +1,2 @@
 plugin_name=JGit Command Line Interface Tests
-provider_name=Eclipse.org
+provider_name=Eclipse JGit

org.eclipse.jgit.pgm/plugin.properties

@@ -1,2 +1,2 @@
 plugin_name=JGit Command Line Interface
-provider_name=Eclipse.org
+provider_name=Eclipse JGit

org.eclipse.jgit.test/plugin.properties

@@ -1,2 +1,2 @@
 plugin_name=JGit Core Tests
-provider_name=Eclipse.org
+provider_name=Eclipse JGit

org.eclipse.jgit.ui/plugin.properties

@@ -1,2 +1,2 @@
 plugin_name=JGit AWT User Interface
-provider_name=Eclipse.org
+provider_name=Eclipse JGit