Added Cloud-connector API in base layer for account server

Added Cloud-connector API in base layer for account server

added APIs to support functions about account authorization
  : Sign-up, Sign-in, Sign-out, Refresh Access token
one existing build option is used to inlude APIs
  : WITH_CLOUD
and it is not supported on client mode for now
since device id is not generated on client mode (JIRA-1184)

Change-Id: Iefdf52545580efa4c533ff77137bce6c779bcaba
Signed-off-by: Jaewook Jung <jw0213.jung@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/9121
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: jihwan seo <jihwan.seo@samsung.com>
Reviewed-by: Jaehong Jo <jaehong.jo@samsung.com>
Reviewed-by: Ashok Babu Channa <ashok.channa@samsung.com>