MySQL table_open_cache size unusually small

https://bugzilla.redhat.com/show_bug.cgi?id=1080547
Users do not have the ability to change table_open_cache to values other
than 4 (and have them stick).  The set value seems too low to allow
database operations to remain efficient.  For example, in my app I have
18 tables that are constantly being written to from a single persistent
connection, but can only have four tables cached at a time.  This leads
to tables having to be re-opened which causes fairly significant disk
I/O.
oo-install Guide: Added info on new -l CLI option
Fix raise during initial deployment meta creation

Add a File.exists? check to prevent File.stat from raising when
no deployment metadata yet exists and allow defaults to be
written.

Resolve bug https://bugzilla.redhat.com/show_bug.cgi?id=1075673
Merge pull request #5093 from nhr/oo_install_guide_update

Merged by openshift-bot
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