Add DateTime to the collect-i-*.tgz file name.

[aws]

Add DateTime to the collect-i-*.tgz file name.

[fjromerom]

I think makes more sense if we add the datetime variable in the pack routine since the try_set_instance_collectdir routine is intended to discover the instance ID only:

${tar_bin} -cvzf "$curdir/$pack_name-$datetime".tgz "$collectdir" > /dev/null 2>&1

Additionally, we have to declare the variable here as follows:

# datetime is the date and time when the script was executed used in pack()
datetime=`date +%Y%m%d%H%M`
# pack_name is the name of the resulting tarball. This will generally
# be collect-i-fffffffffffffffff-ddddddddtttt, where i-ffffffffffffffffff is the
# instance id and ddddddddtttt is the date and time.
pack_name="collect"

Also remember to update the README usage section.

On the other hand, it seems the variable dstdir is not declared, let's add it here:

# dstdir is the destination where the logs collected are placed.
dstdir=''  # defined in several routines

[Realmonia]

Fixed by @rohanmangal - thanks for the contribution!