Fix for starting httpd on r3.4xlarge

[jey]

The merge of #76 improved things in terms of starting Apache on r3.4xlarge instances, but I also had to add this patch to fix the PHP module version before service httpd start worked successfully.

I have not tested this on other instance types. (Apparently there's some differences between the HVM and non-HVM AMIs?)

[shivaram]

@fredcons @nchammas -- Any thoughts on this ?

[nchammas]

Look innocuous, but I won't be able to test this.

Also, any reason this isn't being opened against branch-1.3 or branch-1.4?

v4 is for Spark 1.2.

[jey]

I'm using Spark 1.2.1 and have only tested there

[fredcons]

Any idea on why the php version has changed ? A different underlying OS ?
In any case, the fix looks innocuous, as stated earlier by @nchammas

[jey]

My hunch is that the HVM and non-HVM AMIs are being updated separately and got out of sync. (Just a guess -- I have not tried both.)

[shivaram]

Yeah the reason I am wary of merging this is that I don't want this to break non-HVM AMIs. @nchammas @fredcons does httpd work on HVM instances for you with any Spark version (1.2 / 1.3 etc.)

[shivaram]

@jey We have a newer PR for this in #121 which also installs the exact httpd version required -- so I'm closing this PR just to clear the queue for now.