pfSense

Use !empty instead of isset to prevent accidental deletion of the last used repository URL when firmware update gitsync settings have been saved without a repository URL.

Fix filename used in check for existence of the uniprocessor kernel to match the one that was being used to extract.

Fixup the kernel upgrade code a bit to be safer, and assume SMP in the default case, and also warn if there was a problem. Should fix #1427

Unbreak a number of explode() replacements which required preg_split()

The function split() is replaced by the function explode(). Starting with PHP 5.3 this is deprecated and with version 6 gone.
Replacing it surpresses all the warnings

Clean up .profile and .shrc

Setup serial bits after upgrade on NanoBSD, too.

Move the code to touch needs_package_sync into the shell script portion of the post upgrade command. The PHP portion will fail spectacularly during the 1.2.3-to-2.0 upgrade trying to run the new binaries on the old OS. The shell script part still works. Fixes #1251 enough for what we need. The PHP code can never run properly there, but at least we can trigger the package reinstall and the rest can sort itself out when 2.0 boots the first time.

Exclude loader.conf from being update during kernel update

We no longer use /var/run/config.lock - catch up to other progress. Also, use lockf to test if the config is locked now, with a 30 second timeout.