chore(rc,profile,aliases,completion,libs,functions): Remove shebangs from sourced files

These files are always sourced (never executed directly), so the
#!/bin/bash shebang is inert and misleading. Drop it consistently
across rc.d/*, profile.d/*, and aliases.d/*.

aliases.d/openvswitch

@@ -1,5 +1,3 @@
-#!/bin/bash
-
 if (which ovs-appctl &> /dev/null); then alias appctl='sudo ovs-appctl'; fi
 if (which ovs-vsctl  &> /dev/null); then alias vsctl='sudo ovs-vsctl';   fi
 if (which ovs-ofctl  &> /dev/null); then alias ofctl='sudo ovs-ofctl';   fi