PatchSet: Correct misspelling and type of pushCertificate field

I519240547 extended the patch_sets table with a pushCertificate column
to store push the certificate that was used when pushing a signed
commit.

However, the column type VARCHAR(255) is too small for PGP certificate
descriptions. The column name was also misspelled as "pushCertficate"
(missing a 'i').

Extend the column from VARCHAR(255) to CLOB, as used in the account
table ssh key column. At the same time, correct the misspelling.

Reported-By: Henrik Laban Sköllermark <laban@kryo.se>
Change-Id: I3dff91041c00f619f06c0e64c5cb09e3987eac9a

gerrit-server/src/main/java/com/google/gerrit/server/schema/SchemaVersion.java

@@ -32,7 +32,7 @@ import java.util.List;
 /** A version of the database schema. */
 public abstract class SchemaVersion {
   /** The current schema version. */
-  public static final Class<Schema_116> C = Schema_116.class;
+  public static final Class<Schema_117> C = Schema_117.class;
 
   public static int getBinaryVersion() {
     return guessVersion(C);

gerrit-server/src/main/java/com/google/gerrit/server/schema/Schema_117.java

@@ -0,0 +1,41 @@
+// Copyright (C) 2016 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.schema;
+
+import com.google.gerrit.reviewdb.server.ReviewDb;
+import com.google.gwtorm.jdbc.JdbcSchema;
+import com.google.gwtorm.server.OrmException;
+import com.google.inject.Inject;
+import com.google.inject.Provider;
+
+import java.sql.SQLException;
+import java.sql.Statement;
+
+public class Schema_117 extends SchemaVersion {
+  @Inject
+  Schema_117(Provider<Schema_116> prior) {
+    super(prior);
+  }
+
+  @Override
+  protected void preUpdateSchema(ReviewDb db) throws OrmException {
+    renameColumn(db, "patch_sets", "push_certficate", "push_certificate");
+    try (Statement stmt = ((JdbcSchema) db).getConnection().createStatement()) {
+      stmt.execute("ALTER TABLE patch_sets MODIFY push_certificate clob");
+    } catch (SQLException e) {
+      // Ignore.  Type may have already been modified manually.
+    }
+  }
+}