PAT port capacity increase, interim logging, and block recycling

Increased PAT port capacity is supported on devices with next-generation Services Processing Cards (SPCs) using the CLI option port-scaling-enlargement, at the [edit security nat source] hierarchy level. Interim logging and block recycling for port block allocation (PBA) are supported on devices using the CLI options interim-logging-interval and last-block-recycle-timeout at the [edit security nat source pool poolname port block-allocation] hierarchy level.