Squash redundant string concatenations introduced by google-java-format

Reformatting the code with google-java-format tool in change Id5f3c6de9
resulted in wrapped lines being unwrapped to the new 100 columns limit.

In cases where the wrapped line was wrapped on a string concatenation,
the resulting long line now includes redundant concatenations. See the
upstream issue [1] for an example of this.

Squash the redundant concatenations with:

  git ls-files | grep java$ | xargs sed -i '' 's/" + "//g'

(note: this also resulted in a couple of unwanted changes; those are
manually undone.)

[1] https://github.com/google/google-java-format/issues/122

Change-Id: I7348413ae460c8c7a0b0c72dab0a1ae7275a2ec3

gerrit-pgm/src/main/java/com/google/gerrit/pgm/util/SiteProgram.java

@@ -97,7 +97,7 @@ public abstract class SiteProgram extends AbstractProgram {
   protected void mustHaveValidSite() throws Die {
     if (!Files.exists(sitePath.resolve("etc").resolve("gerrit.config"))) {
       throw die(
-          "not a Gerrit site: '" + getSitePath() + "'\n" + "Perhaps you need to run init first?");
+          "not a Gerrit site: '" + getSitePath() + "'\nPerhaps you need to run init first?");
     }
   }