netd: Rename QualcommSoftapCmd.cpp to QsoftapCmd.cpp

 * For matching CAF upstream

Change-Id: I7d6e33c2f18ed4a6390d73767442d60cb42a5f8b
netd: Test the return value from snprintf() in runCommand()

Properly test the return value from snprintf() in runCommand() to
avoid error conditions.

Change-Id: Idfa099e5eb2b8ff3f5b67a0a3aea3174045f4563
CRs-fixed: 549627