LP#1691473 Internal Apache HTTP port configuration

LP#1691473 Internal Apache HTTP port configuration

Adds an optional new Apache/mod_perl configuration variable for defining
the port Apache listens on for HTTP traffic.  This resolves an issue
where added content lookups attempting HTTP requests on the local Apache
instance on port 80 failed because Apache was using non-standard ports.

To test:

[1] Set a value for OILSWebInternalHTTPPort that's not "80".
[2] Restart/reload Apache
[3] Load a record detail in the catalog
[4] Confirm opensrf logs show:

"tpac: added content connecting to <ip-address>:<new-port> / <hostname>

<new-port> should be the value configured for OILSWebInternalHTTPPort.

Signed-off-by: Bill Erickson <berickxx@gmail.com>