[packages] aiccu: retry TIC login on nonfatal failures (#10310)

[packages] aiccu: retry TIC login on nonfatal failures (#10310)
* change the tic_Login() function to indicate fatal vs. nonfatal login errors
* retry tic_Login() on nonfatal failures, wait at least 10 seconds per retry
* increase delay by 10 seconds per try until the maximum of 120 seconds is reached
* move aiccu start command into background as it can take a long time to deamonize due to retries, blocking subsequent init scripts
* remove hotplug script for aiccu, the running instances should recover themselves if time and connectivity become available

git-svn-id: svn://svn.openwrt.org/openwrt/packages@28796 3c298f89-4303-0410-b956-a3cf2f4a3e73