Suggestion: Update installer scripts to set kernel parameters for Mongo

If a user follows our standard installation instructions, either using the one-liner, or following the manual steps, they will get these warning messages with MongoDB:

2017-02-01T23:10:31.846+0000 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
2017-02-01T23:10:31.846+0000 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2017-02-01T23:10:31.847+0000 I CONTROL  [initandlisten]
2017-02-01T23:10:31.847+0000 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
2017-02-01T23:10:31.847+0000 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2017-02-01T23:10:31.847+0000 I CONTROL  [initandlisten]
2017-02-01T23:10:31.847+0000 I CONTROL  [initandlisten] ** WARNING: soft rlimits too low. rlimits set to 4096 processes, 64000 files. Number of processes should be at least 32000 : 0.5 times number of files.

(NB Above is seen with CentOS 7.3. Ubuntu 14.04 will only have the first two warnings).

Should we:
(A) Update our installer script to set these values
(B) Update our documentation to recommend that the user changes these values

Thoughts?

Locate the standard installation one-liner, manual installation steps, and installer scripts, then compare the reported CentOS 7.3 and Ubuntu 14.04 warnings. Done means the project has a decided and documented approach for the MongoDB kernel parameters and soft rlimits, with the affected installation path updated accordingly.