Fix .deb install failure when PBXT is not built-in.

Fix egrep syntax error in .deb preinst.

debian/dist/Debian/mariadb-server-5.5.postinst

@@ -21,7 +21,7 @@ invoke() {
   fi
 }
 
-MYSQL_BOOTSTRAP="/usr/sbin/mysqld --bootstrap --user=mysql --skip-grant-tables --innodb=OFF --pbxt=OFF --default-storage-engine=myisam"
+MYSQL_BOOTSTRAP="/usr/sbin/mysqld --bootstrap --user=mysql --skip-grant-tables --loose-innodb=OFF --loose-pbxt=OFF --default-storage-engine=myisam"
 
 test_mysql_access() {
        mysql --no-defaults -u root -h localhost </dev/null >/dev/null 2>&1

debian/dist/Ubuntu/mariadb-server-5.5.postinst

@@ -21,7 +21,7 @@ invoke() {
   fi
 }
 
-MYSQL_BOOTSTRAP="/usr/sbin/mysqld --bootstrap --user=mysql --skip-grant-tables --innodb=OFF --pbxt=OFF --default-storage-engine=myisam"
+MYSQL_BOOTSTRAP="/usr/sbin/mysqld --bootstrap --user=mysql --skip-grant-tables --loose-innodb=OFF --loose-pbxt=OFF --default-storage-engine=myisam"
 
 test_mysql_access() {
        mysql --no-defaults -u root -h localhost </dev/null >/dev/null 2>&1

debian/mariadb-server-5.5.preinst

@@ -49,7 +49,7 @@ stop_server() {
 this_version=5.5
 
 # Abort if an NDB cluster is in use.
-if egrep -qi -r '^[^#]*ndb.connectstring|^[:space:]*\[[:space:]*ndb_mgmd' /etc/mysql/; then
+if egrep -qi -r '^[^#]*ndb.connectstring|^[[:space:]]*\[[[:space:]]*ndb_mgmd' /etc/mysql/; then
   db_fset mysql-server/no_upgrade_when_using_ndb seen false || true
   db_input high mysql-server/no_upgrade_when_using_ndb || true
   db_go