Fix initialization issue of pmcertificatemgr

:Release Notes:
Fix procedure of local certificates database creation in
case it's not exists during pmcerificatemgr initialisation.

:Detailed Notes:
- pmcertificatemgr assumes that root for certificates database
  is /var/ssl. If it's not exist in rootfs, then pmcertificatemgr
  creates required files and directories. This procedure failed
  after creation of 'certs' directory. The reason was in "Mkdir"
  function that failed if directory already existed. Now "Make"
  function checks if directory exists and return OK status if so.
- Initialize function(CertInitCertMgr) use global environment
  variables or the default path defined in header for finding
  openssl.cnf, but default path was wrong. Now it's changed to
  correct value: /etc/openssl/openssl.cnf --> /etc/ssl/openssl.cnf

:Testing Performed:
- Stop PmCertificateMgrService
- Delete local certs database directory (/var/ssl)
- Try to operate on local certificates database via service: add, delete,
  list
- All required files and directories were created successfully
- All operation were performed successfully
- This procedure were repeated several times

:QA Notes:

:Issues Addressed:
[GF-7979] - pmcertificatemgr does not initialize
[GF-7736] - pmcertificatemgr update
Open-webOS-DCO-1.0-Signed-off-by: Viacheslav Belenko <viacheslav.belenko@lge.com>

Change-Id: If4ed64c1cc671dbe0ae0b70e1c98e2017eeae350
Reviewed-on: https://g2g.palm.com/3010
Reviewed-by: Build Verification
Reviewed-by: Keith Derrick <keith.derrick@lge.com>
Reviewed-by: Alex Berdnikov <alex.berdnikov@lge.com>
Tested-by: Alex Berdnikov <alex.berdnikov@lge.com>
Reviewed-by: Seonho Park <seonho.park@lge.com>
Tested-by: Seonho Park <seonho.park@lge.com>