PORT=1248
BEACON_TIMEOUT=5
DEFAULT_BUFSIZE=8192

PORT=1248
BEACON_TIMEOUT=5
DEFAULT_BUFSIZE=8192
DEFAULT_CACHE_LIFETIME=900

Add config key for default cache lifetime
Add config key for default cache lifetime

  PORT=1248
  BEACON_TIMEOUT=5
  DEFAULT_BUFSIZE=8192
+ DEFAULT_CACHE_LIFETIME=900
  
Add config key for default cache lifetime
## Code Before:
PORT=1248
BEACON_TIMEOUT=5
DEFAULT_BUFSIZE=8192

## Instruction:
Add config key for default cache lifetime
## Code After:
PORT=1248
BEACON_TIMEOUT=5
DEFAULT_BUFSIZE=8192
DEFAULT_CACHE_LIFETIME=900
