MT#62763 Fix shellcheck issues

Warned-by: shellcheck
Change-Id: I11f7609342386f3cd4efaa5bcaf6539e9e6e297d

bash/sipwise-base.sh

@@ -1,6 +1,7 @@
 #
 # Collection of Sipwise common bash functions.
 #
+# shellcheck shell=bash
 
 set -e
 set -u

bash/sipwise-init.sh

@@ -1,3 +1,4 @@
 #
 # Collection of Sipwise sysvinit bash functions.
 #
+# shellcheck shell=bash