conf: Extract functions to reduce duplicate code

conf: Extract functions to reduce duplicate code

Find configuration parsing codes that are predicted to be commonly used and
extract them as functions.

'proc_conf_info' structure is used to store configurations of
per process information. In addition, this structure can be used
for all kind of configurations in resourced
(e.g., limiter.conf, optimizer.conf, and process.conf).
Therefore, initialization and inserting of 'proc_conf_info'
are predicted to be commonly used.

Change-Id: I161ffce5c6b28ee4acf9610af7c984f2323ea07e
Signed-off-by: Unsung Lee <unsung.lee@samsung.com>