PIM-3471 Add a warning when we reach the max indexes of a mongo collection

With Mongo 2.6.5, when try to create to much indexes, a MongoResultException is raised.

Idea is to add a notice to prevent the following error when we install the PIM with Mongo and more than 64 indexes for values,

`Error #67 in class MongoResultException: localhost:27017: add index fails, too many indexes for pim_ce_mongo.pim_catalog_product key:{ normalizedData.completenesses.mobile-en_US: 1 }`

The new message is the following, it doesnt stop the install

`Too many MongoDB indexes (64), not way to add Array
(
    [0] => normalizedData.light_metering-de_DE
    [1] => normalizedData.light_metering-en_US
    [2] => normalizedData.light_metering-fr_FR
)`

TODO
 - [ ] use monolog to log a warning

| Q                    | A
| -------------------- | ---
| Bug fix?             |
| New feature?         |
| BC breaks?           |
| CI currently passes? |
| Tests pass?          |
| Scenarios pass?      |
| Checkstyle issues?*  |
| PMD issues?**        |
| Changelog updated?   |
| Fixed tickets        |
| DB schema updated?   |
| Migration script?    |
| Doc PR               |